Subject: Re: [Mgs] Mgs Digest, Vol 195, Issue 1

From: Eric Russell <[email-masked]>
Date: Tue, 1 Aug 2023 14:10:52 -0400

--===============2482552532727027938==

--0000000000004d7ae40601e079b9
Content-Transfer-Encoding: quoted-printable

I believe a tach (short for tachometer) and rev counter refer to the same
instrument.

And, yes, all MGAs came with a tach as original equipment.

EjR

On Tue, Aug 1, 2023 at 2:04=E2=80=AFPM <[email-masked]> wrote:

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> Today's Topics:
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>    1. Re: Mgs Digest, Vol 194, Issue 12 (Eric Russell)
>    2. Re: Mgs Digest, Vol 194, Issue 12 (Paul Hunt)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Mon, 31 Jul 2023 16:21:38 -0400
> From: Eric Russell <[email-masked]>
> To: [email-masked]
> Subject: Re: [Mgs] Mgs Digest, Vol 194, Issue 12
> Message-ID:
>         <
> [email-masked]>
> Content-Type: text/plain; charset=3D"utf-8"
>
> My guess is an MGA tach face (Jaeger) or perhaps MGA tach face & case was
> used with a different tach's internals. MGB tachs were 'Smiths'.
>
> MGB tach for MGA is described here:
> http://mgaguru.com/mgtech/electric/et202c.htm
>
> EjR
>
> On Mon, Jul 31, 2023 at 2:08?PM <[email-masked]> wrote:
>
> > Send Mgs mailing list submissions to
> >         [email-masked]
> >
> > To subscribe or unsubscribe via the World Wide Web, visit
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> > or, via email, send a message with subject or body 'help' to
> >         [email-masked]
> >
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> >
> > When replying, please edit your Subject line so it is more specific
> > than "Re: Contents of Mgs digest..."
> >
> >
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> >
> >
> >
> > Today's Topics:
> >
> >    1. mga 1500 with early 5 main mgb engine (dave northrup)
> >    2. Re: mga 1500 with early 5 main mgb engine (Max Heim)
> >    3. Re: mga 1500 with early 5 main mgb engine (Paul Hunt)
> >
> >
> > ----------------------------------------------------------------------
> >
> > Message: 1
> > Date: Mon, 31 Jul 2023 00:22:55 +0000
> > From: dave northrup <[email-masked]>
> > To: "[email-masked]" <[email-masked]>
> > Subject: [Mgs] mga 1500 with early 5 main mgb engine
> > Message-ID: <[email-masked]>
> > Content-Type: text/plain; charset=3D"us-ascii"
> >
> > Negative ground, car runs smoothly, need to install the electric tach
> > which supposedly was previously installed in this car and working.
> >
> > On the back view, what hooks up where?  I am pretty sure the tab, and t=
he
> > screw, are ground.
> >
> > The other two - one needs to go to power and the other to the coil.  I
> > think one is a female bullet connector; the other is male.  Which goes =
to
> > power and which to the coil?
> > -------------- next part --------------
> > An HTML attachment was scrubbed...
> > URL: <
> >
> http://autox.team.net/pipermail/mgs/attachments/20230731/850f2071/attachm=
ent-0001.htm
> > >
> > -------------- next part --------------
> > A non-text attachment was scrubbed...
> > Name: tach front view.jpg
> > Type: image/jpeg
> > Size: 827772 bytes
> > Desc: tach front view.jpg
> > URL: <
> >
> http://autox.team.net/pipermail/mgs/attachments/20230731/850f2071/attachm=
ent-0002.jpg
> > >
> > -------------- next part --------------
> > A non-text attachment was scrubbed...
> > Name: tach rear view.jpg
> > Type: image/jpeg
> > Size: 826250 bytes
> > Desc: tach rear view.jpg
> > URL: <
> >
> http://autox.team.net/pipermail/mgs/attachments/20230731/850f2071/attachm=
ent-0003.jpg
> > >
> >
> > ------------------------------
> >
> > Message: 2
> > Date: Sun, 30 Jul 2023 17:52:40 -0700
> > From: Max Heim <[email-masked]>
> > To: "[email-masked]" <[email-masked]>
> > Subject: Re: [Mgs] mga 1500 with early 5 main mgb engine
> > Message-ID: <[email-masked]>
> > Content-Type: text/plain; charset=3D"utf-8"
> >
> > Hmm, the back of that tach case has obviously been modified. Are you su=
re
> > it still contains the matching internals? I say this because for 20
> years I
> > ran my Mk. I MGB with the original tach case, faceplate & needle, but
> with
> > a cheap auto parts store mini-tach inside the case. The only
> modifications
> > were two small screw holes to attach the mechanism.
> >
> > An original MGB Mk. I tach would have had a loop in the white wire,
> > attached to the back of the case with a thumb nut and a thin U-shaped
> brass
> > bracket. I am not seeing that on yours.
> >
> > Actually, I guess it is unclear whether you are talking about an MGA ta=
ch
> > or an early MGB tach...
> >
> > --
> > Max Heim
> > '66 MGB
> >
> > > On Jul 30, 2023, at 5:22 PM, dave northrup <[email-masked]> wrote:
> > >
> > > Negative ground, car runs smoothly, need to install the electric tach
> > which supposedly was previously installed in this car and working.
> > >
> > > On the back view, what hooks up where?  I am pretty sure the tab, and
> > the screw, are ground.
> > >
> > > The other two ? one needs to go to power and the other to the coil.  =
I
> > think one is a female bullet connector; the other is male.  Which goes =
to
> > power and which to the coil?
> > > <tach front view.jpg><tach rear
> > view.jpg>_______________________________________________
> > >
> > > Donate: http://www.team.net/donate.html <
> http://www.team.net/donate.html
> > >
> > > Suggested annual donation  $12.75
> > >
> > > Archive: http://www.team.net/pipermail/mgs <
> > http://www.team.net/pipermail/mgs> http://autox.team.net/archive <
> > http://autox.team.net/archive>
> > >
> > > Unsubscribe:
> http://autox.team.net/mailman/options/mgs/[email-masked]
> > <http://autox.team.net/mailman/options/mgs/[email-masked]>
> > -------------- next part --------------
> > An HTML attachment was scrubbed...
> > URL: <
> >
> http://autox.team.net/pipermail/mgs/attachments/20230730/c68decc6/attachm=
ent-0001.htm
> > >
> >
> > ------------------------------
> >
> > Message: 3
> > Date: Mon, 31 Jul 2023 08:38:26 +0100
> > From: Paul Hunt <[email-masked]>
> > To: [email-masked]
> > Subject: Re: [Mgs] mga 1500 with early 5 main mgb engine
> > Message-ID: <[email-masked]>
> > Content-Type: text/plain; charset=3D"utf-8"; Format=3D"flowed"
> >
> > Not an MGB reference number, it looks like it has later internals than
> > but would still be the current-operated type i.e. RVI where the power t=
o
> > the coil comes via the tach.? The ignition switch would be connected to
> > the male bullet and the female bullet to the coil.? 12v (also from the
> > ignition) to the spade and earth to the case.? When used on the MGB
> > there were separate wires from the ignition switch to the spade and to
> > the male bullet but you can tee from one to the other rather than
> > running a separate wire.
> >
> > It would have been helpful to see the top half of the dial where it
> > might have shown RVI and what polarity it was.? I suspect it would show
> > positive earth, but those electronics would have been used with negativ=
e
> > earth in an MGB for example so it looks like it has been converted by
> > swapping the guts instead of swapping the wires round internally.? If
> > that tach was used after the car was converted to negative earth it
> > would make sense.
> >
> > PaulH.
> >
> > On 31/07/2023 01:22, dave northrup wrote:
> > >
> > > Negative ground, car runs smoothly, need to install the electric tach
> > > which supposedly was previously installed in this car and working.
> > >
> > > On the back view, what hooks up where?? I am pretty sure the tab, and
> > > the screw, are ground.
> > >
> > > The other two ? one needs to go to power and the other to the coil.? =
I
> > > think one is a female bullet connector; the other is male.? Which goe=
s
> > > to power and which to the coil?
> > >
> > >
> > > _______________________________________________
> > >
> > > [email-masked]
> > > Donate:http://www.team.net/donate.html
> > > Suggested annual donation  $12.75
> > >
> > > Archive:http://www.team.net/pipermail/mgs
> http://autox.team.net/archive
> > >
> > > Unsubscribe:
> > http://autox.team.net/mailman/options/mgs/[email-masked]
> > -------------- next part --------------
> > An HTML attachment was scrubbed...
> > URL: <
> >
> http://autox.team.net/pipermail/mgs/attachments/20230731/0ad7ea29/attachm=
ent-0001.htm
> > >
> >
> > ------------------------------
> >
> > Subject: Digest Footer
> >
> > _______________________________________________
> > Mgs mailing list
> > [email-masked]
> > http://autox.team.net/mailman/listinfo/mgs
> >
> >
> > ------------------------------
> >
> > End of Mgs Digest, Vol 194, Issue 12
> > ************************************
> >
> -------------- next part --------------
> An HTML attachment was scrubbed...
> URL: <
> http://autox.team.net/pipermail/mgs/attachments/20230731/144c49a7/attachm=
ent-0001.htm
> >
>
> ------------------------------
>
> Message: 2
> Date: Tue, 1 Aug 2023 08:13:10 +0100
> From: Paul Hunt <[email-masked]>
> To: [email-masked]
> Subject: Re: [Mgs] Mgs Digest, Vol 194, Issue 12
> Message-ID: <[email-masked]>
> Content-Type: text/plain; charset=3D"utf-8"; Format=3D"flowed"
>
> Did any MGAs leave the factory with a tach?? Early MGBs had a rev
> counter before they got the tach.
>
> On 31/07/2023 21:21, Eric Russell wrote:
> > My guess is an MGA tach face (Jaeger) or perhaps MGA tach face & case
> > was used with a different tach's internals. MGB tachs were 'Smiths'.
> >
> > MGB tach for MGA is described here:
> > http://mgaguru.com/mgtech/electric/et202c.htm
> >
> > EjR
> >
> > On Mon, Jul 31, 2023 at 2:08?PM <[email-masked]> wrote:
> >
> >     Send Mgs mailing list submissions to
> >     [email-masked]
> >
> >     To subscribe or unsubscribe via the World Wide Web, visit
> >     http://autox.team.net/mailman/listinfo/mgs
> >     or, via email, send a message with subject or body 'help' to
> >     [email-masked]
> >
> >     You can reach the person managing the list at
> >     [email-masked]
> >
> >     When replying, please edit your Subject line so it is more specific
> >     than "Re: Contents of Mgs digest..."
> >
> >
> >     Donate: http://www.team.net/donate.html
> >     Suggested annual donation? $12.75
> >     Archive: http://www.team.net/archive
> >     Forums: http://www.team.net/forums
> >
> >
> >
> >     Today's Topics:
> >
> >     ? ?1. mga 1500 with early 5 main mgb engine (dave northrup)
> >     ? ?2. Re: mga 1500 with early 5 main mgb engine (Max Heim)
> >     ? ?3. Re: mga 1500 with early 5 main mgb engine (Paul Hunt)
> >
> >
> >
>  ----------------------------------------------------------------------
> >
> >     Message: 1
> >     Date: Mon, 31 Jul 2023 00:22:55 +0000
> >     From: dave northrup <[email-masked]>
> >     To: "[email-masked]" <[email-masked]>
> >     Subject: [Mgs] mga 1500 with early 5 main mgb engine
> >     Message-ID: <[email-masked]>
> >     Content-Type: text/plain; charset=3D"us-ascii"
> >
> >     Negative ground, car runs smoothly, need to install the electric
> >     tach which supposedly was previously installed in this car and
> >     working.
> >
> >     On the back view, what hooks up where?? I am pretty sure the tab,
> >     and the screw, are ground.
> >
> >     The other two - one needs to go to power and the other to the
> >     coil.? I think one is a female bullet connector; the other is
> >     male.? Which goes to power and which to the coil?
> >     -------------- next part --------------
> >     An HTML attachment was scrubbed...
> >     URL:
> >     <
> http://autox.team.net/pipermail/mgs/attachments/20230731/850f2071/attachm=
ent-0001.htm
> >
> >     -------------- next part --------------
> >     A non-text attachment was scrubbed...
> >     Name: tach front view.jpg
> >     Type: image/jpeg
> >     Size: 827772 bytes
> >     Desc: tach front view.jpg
> >     URL:
> >     <
> http://autox.team.net/pipermail/mgs/attachments/20230731/850f2071/attachm=
ent-0002.jpg
> >
> >     -------------- next part --------------
> >     A non-text attachment was scrubbed...
> >     Name: tach rear view.jpg
> >     Type: image/jpeg
> >     Size: 826250 bytes
> >     Desc: tach rear view.jpg
> >     URL:
> >     <
> http://autox.team.net/pipermail/mgs/attachments/20230731/850f2071/attachm=
ent-0003.jpg
> >
> >
> >     ------------------------------
> >
> >     Message: 2
> >     Date: Sun, 30 Jul 2023 17:52:40 -0700
> >     From: Max Heim <[email-masked]>
> >     To: "[email-masked]" <[email-masked]>
> >     Subject: Re: [Mgs] mga 1500 with early 5 main mgb engine
> >     Message-ID: <[email-masked]>
> >     Content-Type: text/plain; charset=3D"utf-8"
> >
> >     Hmm, the back of that tach case has obviously been modified. Are
> >     you sure it still contains the matching internals? I say this
> >     because for 20 years I ran my Mk. I MGB with the original tach
> >     case, faceplate & needle, but with a cheap auto parts store
> >     mini-tach inside the case. The only modifications were two small
> >     screw holes to attach the mechanism.
> >
> >     An original MGB Mk. I tach would have had a loop in the white
> >     wire, attached to the back of the case with a thumb nut and a thin
> >     U-shaped brass bracket. I am not seeing that on yours.
> >
> >     Actually, I guess it is unclear whether you are talking about an
> >     MGA tach or an early MGB tach...
> >
> >     --
> >     Max Heim
> >     '66 MGB
> >
> >     > On Jul 30, 2023, at 5:22 PM, dave northrup <[email-masked]>
> wrote:
> >     >
> >     > Negative ground, car runs smoothly, need to install the electric
> >     tach which supposedly was previously installed in this car and
> >     working.
> >     >
> >     > On the back view, what hooks up where?? I am pretty sure the
> >     tab, and the screw, are ground.
> >     >
> >     > The other two ? one needs to go to power and the other to the
> >     coil.? I think one is a female bullet connector; the other is
> >     male.? Which goes to power and which to the coil?
> >     > <tach front view.jpg><tach rear
> >     view.jpg>_______________________________________________
> >     >
> >     > Donate: http://www.team.net/donate.html
> >     <http://www.team.net/donate.html>
> >     > Suggested annual donation? $12.75
> >     >
> >     > Archive: http://www.team.net/pipermail/mgs
> >     <http://www.team.net/pipermail/mgs> http://autox.team.net/archive
> >     <http://autox.team.net/archive>
> >     >
> >     > Unsubscribe:
> >     http://autox.team.net/mailman/options/mgs/[email-masked]
> >     <http://autox.team.net/mailman/options/mgs/[email-masked]>
> >     -------------- next part --------------
> >     An HTML attachment was scrubbed...
> >     URL:
> >     <
> http://autox.team.net/pipermail/mgs/attachments/20230730/c68decc6/attachm=
ent-0001.htm
> >
> >
> >     ------------------------------
> >
> >     Message: 3
> >     Date: Mon, 31 Jul 2023 08:38:26 +0100
> >     From: Paul Hunt <[email-masked]>
> >     To: [email-masked]
> >     Subject: Re: [Mgs] mga 1500 with early 5 main mgb engine
> >     Message-ID: <[email-masked]>
> >     Content-Type: text/plain; charset=3D"utf-8"; Format=3D"flowed"
> >
> >     Not an MGB reference number, it looks like it has later internals
> >     than
> >     but would still be the current-operated type i.e. RVI where the
> >     power to
> >     the coil comes via the tach.? The ignition switch would be
> >     connected to
> >     the male bullet and the female bullet to the coil.? 12v (also from
> >     the
> >     ignition) to the spade and earth to the case.? When used on the MGB
> >     there were separate wires from the ignition switch to the spade
> >     and to
> >     the male bullet but you can tee from one to the other rather than
> >     running a separate wire.
> >
> >     It would have been helpful to see the top half of the dial where it
> >     might have shown RVI and what polarity it was.? I suspect it would
> >     show
> >     positive earth, but those electronics would have been used with
> >     negative
> >     earth in an MGB for example so it looks like it has been converted =
by
> >     swapping the guts instead of swapping the wires round internally.? =
If
> >     that tach was used after the car was converted to negative earth it
> >     would make sense.
> >
> >     PaulH.
> >
> >     On 31/07/2023 01:22, dave northrup wrote:
> >     >
> >     > Negative ground, car runs smoothly, need to install the electric
> >     tach
> >     > which supposedly was previously installed in this car and working=
.
> >     >
> >     > On the back view, what hooks up where?? I am pretty sure the
> >     tab, and
> >     > the screw, are ground.
> >     >
> >     > The other two ? one needs to go to power and the other to the
> >     coil.? I
> >     > think one is a female bullet connector; the other is male.?
> >     Which goes
> >     > to power and which to the coil?
> >     >
> >     >
> >     > _______________________________________________
> >     >
> >     > [email-masked]
> >     > Donate:http://www.team.net/donate.html
> >     > Suggested annual donation? $12.75
> >     >
> >     > Archive:http://www.team.net/pipermail/mgs
> >     http://autox.team.net/archive
> >     >
> >     >
> >     Unsubscribe:
> http://autox.team.net/mailman/options/mgs/[email-masked]
> >     -------------- next part --------------
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ent-0001.htm
> >
> >
> >     ------------------------------
> >
> >     Subject: Digest Footer
> >
> >     _______________________________________________
> >     Mgs mailing list
> >     [email-masked]
> >     http://autox.team.net/mailman/listinfo/mgs
> >
> >
> >     ------------------------------
> >
> >     End of Mgs Digest, Vol 194, Issue 12
> >     ************************************
> >
> >
> > _______________________________________________
> >
> > [email-masked]
> > Donate:http://www.team.net/donate.html
> > Suggested annual donation  $12.75
> >
> > Archive:http://www.team.net/pipermail/mgs  http://autox.team.net/archiv=
e
> >
> > Unsubscribe:
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>
> ------------------------------
>
> Subject: Digest Footer
>
> _______________________________________________
> Mgs mailing list
> [email-masked]
> http://autox.team.net/mailman/listinfo/mgs
>
>
> ------------------------------
>
> End of Mgs Digest, Vol 195, Issue 1
> ***********************************
>

--0000000000004d7ae40601e079b9
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div class=3D"gmail_default" style=3D"font-size:large">I b=
elieve a tach (short for tachometer) and rev counter refer to the same inst=
rument.=C2=A0</div><div class=3D"gmail_default" style=3D"font-size:large"><=
br></div><div class=3D"gmail_default" style=3D"font-size:large">And, yes, a=
ll MGAs came with a tach as original equipment.</div><div class=3D"gmail_de=
fault" style=3D"font-size:large"><br></div><div class=3D"gmail_default" sty=
le=3D"font-size:large">EjR=C2=A0</div></div><br><div class=3D"gmail_quote">=
<div dir=3D"ltr" class=3D"gmail_attr">On Tue, Aug 1, 2023 at 2:04=E2=80=AFP=
M &lt;<a href=3D"mailto:[email-masked]">[email-masked].=
net</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"marg=
in:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1e=
x">Send Mgs mailing list submissions to<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 <a href=3D"mailto:[email-masked]" target=3D=
"_blank">[email-masked]</a><br>
<br>
To subscribe or unsubscribe via the World Wide Web, visit<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 <a href=3D"http://autox.team.net/mailman/listin=
fo/mgs" rel=3D"noreferrer" target=3D"_blank">http://autox.team.net/mailman/=
listinfo/mgs</a><br>
or, via email, send a message with subject or body &#39;help&#39; to<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 <a href=3D"mailto:[email-masked]" t=
arget=3D"_blank">[email-masked]</a><br>
<br>
You can reach the person managing the list at<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 <a href=3D"mailto:[email-masked]" tar=
get=3D"_blank">[email-masked]</a><br>
<br>
When replying, please edit your Subject line so it is more specific<br>
than &quot;Re: Contents of Mgs digest...&quot;<br>
<br>
<br>
et=3D"_blank">http://www.team.net/donate.html</a><br>
Archive: <a href=3D"http://www.team.net/archive" rel=3D"noreferrer" target=
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"_blank">http://www.team.net/forums</a><br>
<br>
<br>
<br>
Today&#39;s Topics:<br>
<br>
=C2=A0 =C2=A01. Re: Mgs Digest, Vol 194, Issue 12 (Eric Russell)<br>
=C2=A0 =C2=A02. Re: Mgs Digest, Vol 194, Issue 12 (Paul Hunt)<br>
<br>
<br>
----------------------------------------------------------------------<br>
<br>
Message: 1<br>
Date: Mon, 31 Jul 2023 16:21:38 -0400<br>
From: Eric Russell &lt;<a href=3D"mailto:[email-masked]" target=3D"_=
blank">[email-masked]</a>&gt;<br>
To: <a href=3D"mailto:[email-masked]" target=3D"_blank">[email-masked].=
net</a><br>
Subject: Re: [Mgs] Mgs Digest, Vol 194, Issue 12<br>
Message-ID:<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &lt;<a href=3D"mailto:CAP7dBXCk4hzrb9Sj%2BPtrny=
[email-masked]" target=3D"_blank">CAP7dBXCk4hz=
[email-masked]</a>&gt;<br>
<br>
My guess is an MGA tach face (Jaeger) or perhaps MGA tach face &amp; case w=
as<br>
used with a different tach&#39;s internals. MGB tachs were &#39;Smiths&#39;=
.<br>
<br>
MGB tach for MGA is described here:<br>
<a href=3D"http://mgaguru.com/mgtech/electric/et202c.htm" rel=3D"noreferrer=
" target=3D"_blank">http://mgaguru.com/mgtech/electric/et202c.htm</a><br>
<br>
EjR<br>
<br>
On Mon, Jul 31, 2023 at 2:08?PM &lt;<a href=3D"mailto:[email-masked]=
m.net" target=3D"_blank">[email-masked]</a>&gt; wrote:<br>
<br>
&gt; Send Mgs mailing list submissions to<br>
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 target=3D"_blank">[email-masked]</a><br>
&gt;<br>
&gt; To subscribe or unsubscribe via the World Wide Web, visit<br>
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&gt; than &quot;Re: Contents of Mgs digest...&quot;<br>
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&gt;<br>
&gt;<br>
&gt;<br>
&gt; Today&#39;s Topics:<br>
&gt;<br>
&gt;=C2=A0 =C2=A0 1. mga 1500 with early 5 main mgb engine (dave northrup)<=
br>
&gt;=C2=A0 =C2=A0 2. Re: mga 1500 with early 5 main mgb engine (Max Heim)<b=
r>
&gt;=C2=A0 =C2=A0 3. Re: mga 1500 with early 5 main mgb engine (Paul Hunt)<=
br>
&gt;<br>
&gt;<br>
&gt; ----------------------------------------------------------------------=
<br>
&gt;<br>
&gt; Message: 1<br>
&gt; Date: Mon, 31 Jul 2023 00:22:55 +0000<br>
&gt; From: dave northrup &lt;<a href=3D"mailto:[email-masked]" target=3D"=
_blank">[email-masked]</a>&gt;<br>
&gt; To: &quot;<a href=3D"mailto:[email-masked]" target=3D"_blank">mgs@=
autox.team.net</a>&quot; &lt;<a href=3D"mailto:[email-masked]" target=
=3D"_blank">[email-masked]</a>&gt;<br>
&gt; Subject: [Mgs] mga 1500 with early 5 main mgb engine<br>
&gt; Message-ID: &lt;<a href=3D"mailto:8ba46f6ebee14b168b5e753f84b72499@ran=
teer.com" target=3D"_blank">[email-masked]</a=
>&gt;<br>
&gt; Content-Type: text/plain; charset=3D&quot;us-ascii&quot;<br>
&gt;<br>
&gt; Negative ground, car runs smoothly, need to install the electric tach<=
br>
&gt; which supposedly was previously installed in this car and working.<br>
&gt;<br>
&gt; On the back view, what hooks up where?=C2=A0 I am pretty sure the tab,=
 and the<br>
&gt; screw, are ground.<br>
&gt;<br>
&gt; The other two - one needs to go to power and the other to the coil.=C2=
=A0 I<br>
&gt; think one is a female bullet connector; the other is male.=C2=A0 Which=
 goes to<br>
&gt; power and which to the coil?<br>
&gt; -------------- next part --------------<br>
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&gt; &gt;<br>
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&gt; URL: &lt;<br>
&gt; <a href=3D"http://autox.team.net/pipermail/mgs/attachments/20230731/85=
0f2071/attachment-0002.jpg" rel=3D"noreferrer" target=3D"_blank">http://aut=
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&gt; &gt;<br>
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&gt; URL: &lt;<br>
&gt; <a href=3D"http://autox.team.net/pipermail/mgs/attachments/20230731/85=
0f2071/attachment-0003.jpg" rel=3D"noreferrer" target=3D"_blank">http://aut=
ox.team.net/pipermail/mgs/attachments/20230731/850f2071/attachment-0003.jpg=
</a><br>
&gt; &gt;<br>
&gt;<br>
&gt; ------------------------------<br>
&gt;<br>
&gt; Message: 2<br>
&gt; Date: Sun, 30 Jul 2023 17:52:40 -0700<br>
&gt; From: Max Heim &lt;<a href=3D"mailto:[email-masked]" target=3D"_blan=
k">[email-masked]</a>&gt;<br>
&gt; To: &quot;<a href=3D"mailto:[email-masked]" target=3D"_blank">mgs@=
autox.team.net</a>&quot; &lt;<a href=3D"mailto:[email-masked]" target=
=3D"_blank">[email-masked]</a>&gt;<br>
&gt; Subject: Re: [Mgs] mga 1500 with early 5 main mgb engine<br>
&gt; Message-ID: &lt;<a href=3D"mailto:983CC3D7-127F-4FD9-97E0-7533897C6FFD=
@sonic.net" target=3D"_blank">[email-masked]=
t</a>&gt;<br>
&gt; Content-Type: text/plain; charset=3D&quot;utf-8&quot;<br>
&gt;<br>
&gt; Hmm, the back of that tach case has obviously been modified. Are you s=
ure<br>
&gt; it still contains the matching internals? I say this because for 20 ye=
ars I<br>
&gt; ran my Mk. I MGB with the original tach case, faceplate &amp; needle, =
but with<br>
&gt; a cheap auto parts store mini-tach inside the case. The only modificat=
ions<br>
&gt; were two small screw holes to attach the mechanism.<br>
&gt;<br>
&gt; An original MGB Mk. I tach would have had a loop in the white wire,<br=
&gt; attached to the back of the case with a thumb nut and a thin U-shaped =
brass<br>
&gt; bracket. I am not seeing that on yours.<br>
&gt;<br>
&gt; Actually, I guess it is unclear whether you are talking about an MGA t=
ach<br>
&gt; or an early MGB tach...<br>
&gt;<br>
&gt; --<br>
&gt; Max Heim<br>
&gt; &#39;66 MGB<br>
&gt;<br>
&gt; &gt; On Jul 30, 2023, at 5:22 PM, dave northrup &lt;<a href=3D"mailto:=
[email-masked]" target=3D"_blank">[email-masked]</a>&gt; wrote:<br>
&gt; &gt;<br>
&gt; &gt; Negative ground, car runs smoothly, need to install the electric =
tach<br>
&gt; which supposedly was previously installed in this car and working.<br>
&gt; &gt;<br>
&gt; &gt; On the back view, what hooks up where?=C2=A0 I am pretty sure the=
 tab, and<br>
&gt; the screw, are ground.<br>
&gt; &gt;<br>
&gt; &gt; The other two ? one needs to go to power and the other to the coi=
l.=C2=A0 I<br>
&gt; think one is a female bullet connector; the other is male.=C2=A0 Which=
 goes to<br>
&gt; power and which to the coil?<br>
&gt; &gt; &lt;tach front view.jpg&gt;&lt;tach rear<br>
&gt; view.jpg&gt;_______________________________________________<br>
&gt; &gt;<br>
&gt; &gt; <a href=3D"mailto:[email-masked]" target=3D"_blank">Mgs@autox=
.team.net</a> &lt;mailto:<a href=3D"mailto:[email-masked]" target=3D"_b=
lank">[email-masked]</a>&gt;<br>
&gt; &gt; Donate: <a href=3D"http://www.team.net/donate.html" rel=3D"norefe=
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//www.team.net/donate.html</a><br>
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&gt; &gt; Suggested annual donation=C2=A0 $12.75<br>
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&gt; -------------- next part --------------<br>
&gt; An HTML attachment was scrubbed...<br>
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</a><br>
&gt; &gt;<br>
&gt;<br>
&gt; ------------------------------<br>
&gt;<br>
&gt; Message: 3<br>
&gt; Date: Mon, 31 Jul 2023 08:38:26 +0100<br>
&gt; From: Paul Hunt &lt;<a href=3D"mailto:[email-masked]" target=3D=
"_blank">[email-masked]</a>&gt;<br>
&gt; To: <a href=3D"mailto:[email-masked]" target=3D"_blank">mgs@autox.=
team.net</a><br>
&gt; Subject: Re: [Mgs] mga 1500 with early 5 main mgb engine<br>
&gt; Message-ID: &lt;<a href=3D"mailto:86e97849-ea66-aad1-c9f9-0556feb82fb0=
@gmail.com" target=3D"_blank">[email-masked]=
m</a>&gt;<br>
&gt; Content-Type: text/plain; charset=3D&quot;utf-8&quot;; Format=3D&quot;=
flowed&quot;<br>
&gt;<br>
&gt; Not an MGB reference number, it looks like it has later internals than=
<br>
&gt; but would still be the current-operated type i.e. RVI where the power =
to<br>
&gt; the coil comes via the tach.? The ignition switch would be connected t=
o<br>
&gt; the male bullet and the female bullet to the coil.? 12v (also from the=
<br>
&gt; ignition) to the spade and earth to the case.? When used on the MGB<br=
&gt; there were separate wires from the ignition switch to the spade and to=
<br>
&gt; the male bullet but you can tee from one to the other rather than<br>
&gt; running a separate wire.<br>
&gt;<br>
&gt; It would have been helpful to see the top half of the dial where it<br=
&gt; might have shown RVI and what polarity it was.? I suspect it would sho=
w<br>
&gt; positive earth, but those electronics would have been used with negati=
ve<br>
&gt; earth in an MGB for example so it looks like it has been converted by<=
br>
&gt; swapping the guts instead of swapping the wires round internally.? If<=
br>
&gt; that tach was used after the car was converted to negative earth it<br=
&gt; would make sense.<br>
&gt;<br>
&gt; PaulH.<br>
&gt;<br>
&gt; On 31/07/2023 01:22, dave northrup wrote:<br>
&gt; &gt;<br>
&gt; &gt; Negative ground, car runs smoothly, need to install the electric =
tach<br>
&gt; &gt; which supposedly was previously installed in this car and working=
.<br>
&gt; &gt;<br>
&gt; &gt; On the back view, what hooks up where?? I am pretty sure the tab,=
 and<br>
&gt; &gt; the screw, are ground.<br>
&gt; &gt;<br>
&gt; &gt; The other two ? one needs to go to power and the other to the coi=
l.? I<br>
&gt; &gt; think one is a female bullet connector; the other is male.? Which=
 goes<br>
&gt; &gt; to power and which to the coil?<br>
&gt; &gt;<br>
&gt; &gt;<br>
&gt; &gt; _______________________________________________<br>
&gt; &gt;<br>
&gt; &gt; <a href=3D"mailto:[email-masked]" target=3D"_blank">Mgs@autox=
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&gt; &gt; Donate:<a href=3D"http://www.team.net/donate.html" rel=3D"norefer=
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&gt; &gt; Suggested annual donation=C2=A0 $12.75<br>
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ef=3D"http://autox.team.net/archive" rel=3D"noreferrer" target=3D"_blank">h=
ttp://autox.team.net/archive</a><br>
&gt; &gt;<br>
&gt; &gt; Unsubscribe:<br>
&gt; <a href=3D"http://autox.team.net/mailman/options/mgs/paulbhunt73@gmail=
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tions/mgs/[email-masked]</a><br>
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&gt; &gt;<br>
&gt;<br>
&gt; ------------------------------<br>
&gt;<br>
&gt; Subject: Digest Footer<br>
&gt;<br>
&gt; _______________________________________________<br>
&gt; Mgs mailing list<br>
&gt; <a href=3D"mailto:[email-masked]" target=3D"_blank">[email-masked]=
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&gt;<br>
&gt;<br>
&gt; ------------------------------<br>
&gt;<br>
&gt; End of Mgs Digest, Vol 194, Issue 12<br>
&gt; ************************************<br>
&gt;<br>
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<br>
------------------------------<br>
<br>
Message: 2<br>
Date: Tue, 1 Aug 2023 08:13:10 +0100<br>
From: Paul Hunt &lt;<a href=3D"mailto:[email-masked]" target=3D"_bla=
nk">[email-masked]</a>&gt;<br>
To: <a href=3D"mailto:[email-masked]" target=3D"_blank">[email-masked].=
net</a><br>
Subject: Re: [Mgs] Mgs Digest, Vol 194, Issue 12<br>
l.com" target=3D"_blank">[email-masked]</a>=
&gt;<br>
d&quot;<br>
<br>
Did any MGAs leave the factory with a tach?? Early MGBs had a rev <br>
counter before they got the tach.<br>
<br>
On 31/07/2023 21:21, Eric Russell wrote:<br>
&gt; My guess is an MGA tach face (Jaeger) or perhaps MGA tach face &amp; c=
ase <br>
&gt; was used with a different tach&#39;s internals. MGB tachs were &#39;Sm=
iths&#39;.<br>
&gt;<br>
&gt; MGB tach for MGA is described here: <br>
&gt; <a href=3D"http://mgaguru.com/mgtech/electric/et202c.htm" rel=3D"noref=
errer" target=3D"_blank">http://mgaguru.com/mgtech/electric/et202c.htm</a><=
br>
&gt;<br>
&gt; EjR<br>
&gt;<br>
&gt; On Mon, Jul 31, 2023 at 2:08?PM &lt;<a href=3D"mailto:mgs-request@auto=
x.team.net" target=3D"_blank">[email-masked]</a>&gt; wrote:<br>
&gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0Send Mgs mailing list submissions to<br>
&gt;=C2=A0 =C2=A0 =C2=A0<a href=3D"mailto:[email-masked]" target=3D"_bl=
ank">[email-masked]</a><br>
&gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0To subscribe or unsubscribe via the World Wide Web,=
 visit<br>
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&gt;=C2=A0 =C2=A0 =C2=A0or, via email, send a message with subject or body =
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&gt;=C2=A0 =C2=A0 =C2=A0<a href=3D"mailto:[email-masked]" targe=
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&gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0When replying, please edit your Subject line so it =
is more specific<br>
&gt;=C2=A0 =C2=A0 =C2=A0than &quot;Re: Contents of Mgs digest...&quot;<br>
&gt;<br>
&gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0Donate: <a href=3D"http://www.team.net/donate.html"=
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&gt;<br>
&gt;<br>
&gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0Today&#39;s Topics:<br>
&gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0? ?1. mga 1500 with early 5 main mgb engine (dave n=
orthrup)<br>
&gt;=C2=A0 =C2=A0 =C2=A0? ?2. Re: mga 1500 with early 5 main mgb engine (Ma=
x Heim)<br>
&gt;=C2=A0 =C2=A0 =C2=A0? ?3. Re: mga 1500 with early 5 main mgb engine (Pa=
ul Hunt)<br>
&gt;<br>
&gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0---------------------------------------------------=
-------------------<br>
&gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0Message: 1<br>
&gt;=C2=A0 =C2=A0 =C2=A0Date: Mon, 31 Jul 2023 00:22:55 +0000<br>
&gt;=C2=A0 =C2=A0 =C2=A0From: dave northrup &lt;<a href=3D"mailto:dave@rant=
eer.com" target=3D"_blank">[email-masked]</a>&gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0To: &quot;<a href=3D"mailto:[email-masked]" tar=
get=3D"_blank">[email-masked]</a>&quot; &lt;<a href=3D"mailto:mgs@autox=
.team.net" target=3D"_blank">[email-masked]</a>&gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0Subject: [Mgs] mga 1500 with early 5 main mgb engin=
e<br>
&gt;=C2=A0 =C2=A0 =C2=A0Message-ID: &lt;<a href=3D"mailto:8ba46f6ebee14b168=
[email-masked]" target=3D"_blank">8ba46f6ebee14b168b5e753f84b7=
[email-masked]</a>&gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0Content-Type: text/plain; charset=3D&quot;us-ascii&=
quot;<br>
&gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0Negative ground, car runs smoothly, need to install=
 the electric<br>
&gt;=C2=A0 =C2=A0 =C2=A0tach which supposedly was previously installed in t=
his car and<br>
&gt;=C2=A0 =C2=A0 =C2=A0working.<br>
&gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0On the back view, what hooks up where?? I am pretty=
 sure the tab,<br>
&gt;=C2=A0 =C2=A0 =C2=A0and the screw, are ground.<br>
&gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0The other two - one needs to go to power and the ot=
her to the<br>
&gt;=C2=A0 =C2=A0 =C2=A0coil.? I think one is a female bullet connector; th=
e other is<br>
&gt;=C2=A0 =C2=A0 =C2=A0male.? Which goes to power and which to the coil?<b=
r>
&gt;=C2=A0 =C2=A0 =C2=A0-------------- next part --------------<br>
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&gt;=C2=A0 =C2=A0 =C2=A0Size: 826250 bytes<br>
&gt;=C2=A0 =C2=A0 =C2=A0Desc: tach rear view.jpg<br>
&gt;=C2=A0 =C2=A0 =C2=A0URL:<br>
&gt;=C2=A0 =C2=A0 =C2=A0&lt;<a href=3D"http://autox.team.net/pipermail/mgs/=
attachments/20230731/850f2071/attachment-0003.jpg" rel=3D"noreferrer" targe=
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&gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0------------------------------<br>
&gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0Message: 2<br>
&gt;=C2=A0 =C2=A0 =C2=A0Date: Sun, 30 Jul 2023 17:52:40 -0700<br>
&gt;=C2=A0 =C2=A0 =C2=A0From: Max Heim &lt;<a href=3D"mailto:[email-masked]=
et" target=3D"_blank">[email-masked]</a>&gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0To: &quot;<a href=3D"mailto:[email-masked]" tar=
get=3D"_blank">[email-masked]</a>&quot; &lt;<a href=3D"mailto:mgs@autox=
.team.net" target=3D"_blank">[email-masked]</a>&gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0Subject: Re: [Mgs] mga 1500 with early 5 main mgb e=
ngine<br>
&gt;=C2=A0 =C2=A0 =C2=A0Message-ID: &lt;<a href=3D"mailto:983CC3D7-127F-4FD=
[email-masked]" target=3D"_blank">983CC3D7-127F-4FD9-97E0-75=
[email-masked]</a>&gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0Content-Type: text/plain; charset=3D&quot;utf-8&quo=
t;<br>
&gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0Hmm, the back of that tach case has obviously been =
modified. Are<br>
&gt;=C2=A0 =C2=A0 =C2=A0you sure it still contains the matching internals? =
I say this<br>
&gt;=C2=A0 =C2=A0 =C2=A0because for 20 years I ran my Mk. I MGB with the or=
iginal tach<br>
&gt;=C2=A0 =C2=A0 =C2=A0case, faceplate &amp; needle, but with a cheap auto=
 parts store<br>
&gt;=C2=A0 =C2=A0 =C2=A0mini-tach inside the case. The only modifications w=
ere two small<br>
&gt;=C2=A0 =C2=A0 =C2=A0screw holes to attach the mechanism.<br>
&gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0An original MGB Mk. I tach would have had a loop in=
 the white<br>
&gt;=C2=A0 =C2=A0 =C2=A0wire, attached to the back of the case with a thumb=
 nut and a thin<br>
&gt;=C2=A0 =C2=A0 =C2=A0U-shaped brass bracket. I am not seeing that on you=
rs.<br>
&gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0Actually, I guess it is unclear whether you are tal=
king about an<br>
&gt;=C2=A0 =C2=A0 =C2=A0MGA tach or an early MGB tach...<br>
&gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0--<br>
&gt;=C2=A0 =C2=A0 =C2=A0Max Heim<br>
&gt;=C2=A0 =C2=A0 =C2=A0&#39;66 MGB<br>
&gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0&gt; On Jul 30, 2023, at 5:22 PM, dave northrup &lt=
;<a href=3D"mailto:[email-masked]" target=3D"_blank">[email-masked]</a>=
&gt; wrote:<br>
&gt;=C2=A0 =C2=A0 =C2=A0&gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0&gt; Negative ground, car runs smoothly, need to in=
stall the electric<br>
&gt;=C2=A0 =C2=A0 =C2=A0tach which supposedly was previously installed in t=
his car and<br>
&gt;=C2=A0 =C2=A0 =C2=A0working.<br>
&gt;=C2=A0 =C2=A0 =C2=A0&gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0&gt; On the back view, what hooks up where?? I am p=
retty sure the<br>
&gt;=C2=A0 =C2=A0 =C2=A0tab, and the screw, are ground.<br>
&gt;=C2=A0 =C2=A0 =C2=A0&gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0&gt; The other two ? one needs to go to power and t=
he other to the<br>
&gt;=C2=A0 =C2=A0 =C2=A0coil.? I think one is a female bullet connector; th=
e other is<br>
&gt;=C2=A0 =C2=A0 =C2=A0male.? Which goes to power and which to the coil?<b=
r>
&gt;=C2=A0 =C2=A0 =C2=A0&gt; &lt;tach front view.jpg&gt;&lt;tach rear<br>
&gt;=C2=A0 =C2=A0 =C2=A0view.jpg&gt;_______________________________________=
________<br>
&gt;=C2=A0 =C2=A0 =C2=A0&gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0&gt; <a href=3D"mailto:[email-masked]" target=
=3D"_blank">[email-masked]</a> &lt;mailto:<a href=3D"mailto:[email-masked]=
eam.net" target=3D"_blank">[email-masked]</a>&gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0&gt; Donate: <a href=3D"http://www.team.net/donate.=
html" rel=3D"noreferrer" target=3D"_blank">http://www.team.net/donate.html<=
/a><br>
&gt;=C2=A0 =C2=A0 =C2=A0&lt;<a href=3D"http://www.team.net/donate.html" rel=
=3D"noreferrer" target=3D"_blank">http://www.team.net/donate.html</a>&gt;<b=
r>
&gt;=C2=A0 =C2=A0 =C2=A0&gt; Suggested annual donation? $12.75<br>
&gt;=C2=A0 =C2=A0 =C2=A0&gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0&gt; Archive: <a href=3D"http://www.team.net/piperm=
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&gt;=C2=A0 =C2=A0 =C2=A0&gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0&gt; Unsubscribe:<br>
&gt;=C2=A0 =C2=A0 =C2=A0<a href=3D"http://autox.team.net/mailman/options/mg=
s/[email-masked]" rel=3D"noreferrer" target=3D"_blank">http://autox.team.=
net/mailman/options/mgs/[email-masked]</a><br>
&gt;=C2=A0 =C2=A0 =C2=A0&lt;<a href=3D"http://autox.team.net/mailman/option=
s/mgs/[email-masked]" rel=3D"noreferrer" target=3D"_blank">http://autox.t=
eam.net/mailman/options/mgs/[email-masked]</a>&gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0-------------- next part --------------<br>
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&gt;=C2=A0 =C2=A0 =C2=A0URL:<br>
&gt;=C2=A0 =C2=A0 =C2=A0&lt;<a href=3D"http://autox.team.net/pipermail/mgs/=
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cc6/attachment-0001.htm</a>&gt;<br>
&gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0------------------------------<br>
&gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0Message: 3<br>
&gt;=C2=A0 =C2=A0 =C2=A0Date: Mon, 31 Jul 2023 08:38:26 +0100<br>
&gt;=C2=A0 =C2=A0 =C2=A0From: Paul Hunt &lt;<a href=3D"mailto:paulbhunt73@g=
mail.com" target=3D"_blank">[email-masked]</a>&gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0To: <a href=3D"mailto:[email-masked]" target=3D=
"_blank">[email-masked]</a><br>
&gt;=C2=A0 =C2=A0 =C2=A0Subject: Re: [Mgs] mga 1500 with early 5 main mgb e=
ngine<br>
&gt;=C2=A0 =C2=A0 =C2=A0Message-ID: &lt;<a href=3D"mailto:86e97849-ea66-aad=
[email-masked]" target=3D"_blank">86e97849-ea66-aad1-c9f9-05=
[email-masked]</a>&gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0Content-Type: text/plain; charset=3D&quot;utf-8&quo=
t;; Format=3D&quot;flowed&quot;<br>
&gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0Not an MGB reference number, it looks like it has l=
ater internals<br>
&gt;=C2=A0 =C2=A0 =C2=A0than<br>
&gt;=C2=A0 =C2=A0 =C2=A0but would still be the current-operated type i.e. R=
VI where the<br>
&gt;=C2=A0 =C2=A0 =C2=A0power to<br>
&gt;=C2=A0 =C2=A0 =C2=A0the coil comes via the tach.? The ignition switch w=
ould be<br>
&gt;=C2=A0 =C2=A0 =C2=A0connected to<br>
&gt;=C2=A0 =C2=A0 =C2=A0the male bullet and the female bullet to the coil.?=
 12v (also from<br>
&gt;=C2=A0 =C2=A0 =C2=A0the<br>
&gt;=C2=A0 =C2=A0 =C2=A0ignition) to the spade and earth to the case.? When=
 used on the MGB<br>
&gt;=C2=A0 =C2=A0 =C2=A0there were separate wires from the ignition switch =
to the spade<br>
&gt;=C2=A0 =C2=A0 =C2=A0and to<br>
&gt;=C2=A0 =C2=A0 =C2=A0the male bullet but you can tee from one to the oth=
er rather than<br>
&gt;=C2=A0 =C2=A0 =C2=A0running a separate wire.<br>
&gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0It would have been helpful to see the top half of t=
he dial where it<br>
&gt;=C2=A0 =C2=A0 =C2=A0might have shown RVI and what polarity it was.? I s=
uspect it would<br>
&gt;=C2=A0 =C2=A0 =C2=A0show<br>
&gt;=C2=A0 =C2=A0 =C2=A0positive earth, but those electronics would have be=
en used with<br>
&gt;=C2=A0 =C2=A0 =C2=A0negative<br>
&gt;=C2=A0 =C2=A0 =C2=A0earth in an MGB for example so it looks like it has=
 been converted by<br>
&gt;=C2=A0 =C2=A0 =C2=A0swapping the guts instead of swapping the wires rou=
nd internally.? If<br>
&gt;=C2=A0 =C2=A0 =C2=A0that tach was used after the car was converted to n=
egative earth it<br>
&gt;=C2=A0 =C2=A0 =C2=A0would make sense.<br>
&gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0PaulH.<br>
&gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0On 31/07/2023 01:22, dave northrup wrote:<br>
&gt;=C2=A0 =C2=A0 =C2=A0&gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0&gt; Negative ground, car runs smoothly, need to in=
stall the electric<br>
&gt;=C2=A0 =C2=A0 =C2=A0tach<br>
&gt;=C2=A0 =C2=A0 =C2=A0&gt; which supposedly was previously installed in t=
his car and working.<br>
&gt;=C2=A0 =C2=A0 =C2=A0&gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0&gt; On the back view, what hooks up where?? I am p=
retty sure the<br>
&gt;=C2=A0 =C2=A0 =C2=A0tab, and<br>
&gt;=C2=A0 =C2=A0 =C2=A0&gt; the screw, are ground.<br>
&gt;=C2=A0 =C2=A0 =C2=A0&gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0&gt; The other two ? one needs to go to power and t=
he other to the<br>
&gt;=C2=A0 =C2=A0 =C2=A0coil.? I<br>
&gt;=C2=A0 =C2=A0 =C2=A0&gt; think one is a female bullet connector; the ot=
her is male.?<br>
&gt;=C2=A0 =C2=A0 =C2=A0Which goes<br>
&gt;=C2=A0 =C2=A0 =C2=A0&gt; to power and which to the coil?<br>
&gt;=C2=A0 =C2=A0 =C2=A0&gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0&gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0&gt; ______________________________________________=
_<br>
&gt;=C2=A0 =C2=A0 =C2=A0&gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0&gt; <a href=3D"mailto:[email-masked]" target=
=3D"_blank">[email-masked]</a><br>
&gt;=C2=A0 =C2=A0 =C2=A0&gt; Donate:<a href=3D"http://www.team.net/donate.h=
tml" rel=3D"noreferrer" target=3D"_blank">http://www.team.net/donate.html</=
a><br>
&gt;=C2=A0 =C2=A0 =C2=A0&gt; Suggested annual donation? $12.75<br>
&gt;=C2=A0 =C2=A0 =C2=A0&gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0&gt; Archive:<a href=3D"http://www.team.net/piperma=
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&gt;=C2=A0 =C2=A0 =C2=A0-------------- next part --------------<br>
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&gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0------------------------------<br>
&gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0Subject: Digest Footer<br>
&gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0_______________________________________________<br>
&gt;=C2=A0 =C2=A0 =C2=A0Mgs mailing list<br>
&gt;=C2=A0 =C2=A0 =C2=A0<a href=3D"mailto:[email-masked]" target=3D"_bl=
ank">[email-masked]</a><br>
&gt;=C2=A0 =C2=A0 =C2=A0<a href=3D"http://autox.team.net/mailman/listinfo/m=
gs" rel=3D"noreferrer" target=3D"_blank">http://autox.team.net/mailman/list=
info/mgs</a><br>
&gt;<br>
&gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0------------------------------<br>
&gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0End of Mgs Digest, Vol 194, Issue 12<br>
&gt;=C2=A0 =C2=A0 =C2=A0************************************<br>
&gt;<br>
&gt;<br>
&gt; _______________________________________________<br>
&gt;<br>
&gt; <a href=3D"mailto:[email-masked]" target=3D"_blank">[email-masked]=
.net</a><br>
&gt; Donate:<a href=3D"http://www.team.net/donate.html" rel=3D"noreferrer" =
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<br>
------------------------------<br>
<br>
Subject: Digest Footer<br>
<br>
_______________________________________________<br>
Mgs mailing list<br>
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<br>
------------------------------<br>
<br>
End of Mgs Digest, Vol 195, Issue 1<br>
***********************************<br>
</blockquote></div>

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From: PaulHunt73 <[email-masked]> 4HeZqfZ8oOX7ahXf2ukrIcCAFF0I1Rvu5eJ6gjRKaHDq9pN6a74WUDd8LoIQbHA6e5WYuXn4wiU5tmBy9xtNrxbtd755VgqCxmc=
Date: Wed, 2 Aug 2023 08:06:19 +0100

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A rev counter is a mechanical device driven by a cable from the block.  
A tachometer is an electronic device driven by electrical pulses from 
the coil.  They are completely different.

PaulH.

On 01/08/2023 19:10, Eric Russell wrote:
> I believe a tach (short for tachometer) and rev counter refer to the 
> same instrument.
>
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    <p>A rev counter is a mechanical device driven by a cable from the
      block.  A tachometer is an electronic device driven by electrical
      pulses from the coil.  They are completely different.</p>
    <p>PaulH.<br>
    </p>
    <div class="moz-cite-prefix">On 01/08/2023 19:10, Eric Russell
      wrote:<br>
    </div>
    <blockquote type="cite"
cite="mid:CAP7dBXC1pXduo-ydc4k5NMjeekfoc-w2ikYN=j4_g-0S=[email-masked]">
      <meta http-equiv="content-type" content="text/html; charset=UTF-8">
      <div dir="ltr">
        <div class="gmail_default" style="font-size:large">I believe a
          tach (short for tachometer) and rev counter refer to the same
          instrument. </div>
        <div class="gmail_default" style="font-size:large"><br>
        </div>
        <div class="gmail_default" style="font-size:large">And, yes, all
          MGAs came with a tach as original equipment.</div>
        <div class="gmail_default" style="font-size:large"><br>
        </div>
        <div class="gmail_default" style="font-size:large">EjR <br>
        </div>
      </div>
      <br>
    </blockquote>
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From: dave northrup <[email-masked]>
Date: Wed, 2 Aug 2023 13:29:36 +0000

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From: Paul Hunt <[email-masked]>
Date: Thu, 3 Aug 2023 08:44:59 +0100

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Both those are describing the function of the instrument which is the 
same in both cases and is not the point in question.  Even so the first 
definition includes the statement "In formal engineering nomenclature, 
more precise terms are used to distinguish the two.".

The PO's question was how do I connect a _tachometer_ , and the answer 
to that is fundamentally different to a rev counter.  A rev counter 
displays the rate at which a cable drive is turning, a tachometer 
measures the time between successive electrical pulses.  In the rev 
counter case it doesn't matter whether it is on a 4, 6 or 8 (etc.) 
cylinder whereas for a tachometer the pulses from an 8 cylinder engine 
are coming in at twice the rate of a 4-cylinder and there have to be 
_internal_ differences in the tachometer to display that correctly.  If 
the terms are used interchangeably then when responding to a (formal 
engineering?) question you would first have to establish which one is 
being talked about!

PaulH.

On 02/08/2023 14:29, dave northrup wrote:
>
> From Wikipedia
>
> A *tachometer* (*revolution-counter*, *tach*, *rev-counter*, *RPM 
> gauge*) is an instrument measuring the rotation speed of a shaft 
> <https://en.wikipedia.org/wiki/Axle> or disk, as in a motor or other 
> machine.^[1] <https://en.wikipedia.org/wiki/Tachometer#cite_note-1> 
>  The device usually displays the revolutions per minute 
> <https://en.wikipedia.org/wiki/Revolutions_per_minute> (RPM) on a 
> calibrated analogue dial, but digital displays are increasingly common.
>
> The word comes from Greek 
> <https://en.wikipedia.org/wiki/Greek_language> τάχος (/táchos/ "speed") 
> and μέτρον (/métron/ "measure"). Essentially the words tachometer and 
> speedometer <https://en.wikipedia.org/wiki/Speedometer> have identical 
> meaning: a device that measures speed. It is by arbitrary convention 
> that in the automotive world one is used for engine revolutions and 
> the other for vehicle speed. In formal engineering nomenclature, more 
> precise terms are used to distinguish the two.
>
> From dictionary.com
>
> *tachometer*
>
> [ ta-*kom*-i-ter, t/uh/- ]SHOW IPA
>
> ------------------------------------------------------------------------
>
> /noun/
>
>  1. any of various instruments for measuring or indicating velocity or
>     speed, as of a machine, a river, or the blood.
>  2. an instrument measuring revolutions per minute, as of an engine.
>
>
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    <p>Both those are describing the function of the instrument which is
      the same in both cases and is not the point in question.  Even so
      the first definition includes the statement "<span
style="font-size:10.5pt;font-family:&quot;Arial&quot;,sans-serif;color:#202122">In
        formal engineering nomenclature, more precise terms are used to
        distinguish the two.".<br>
      </span></p>
    <p>The PO's question was how do I connect a _tachometer_ , and the
      answer to that is fundamentally different to a rev counter.  A rev
      counter displays the rate at which a cable drive is turning, a
      tachometer measures the time between successive electrical
      pulses.  In the rev counter case it doesn't matter whether it is
      on a 4, 6 or 8 (etc.) cylinder whereas for a tachometer the pulses
      from an 8 cylinder engine are coming in at twice the rate of a
      4-cylinder and there have to be _internal_ differences in the
      tachometer to display that correctly.  If the terms are used
      interchangeably then when responding to a (formal engineering?)
      question you would first have to establish which one is being
      talked about!<br>
    </p>
    <p>PaulH.<br>
    </p>
    <div class="moz-cite-prefix">On 02/08/2023 14:29, dave northrup
      wrote:<br>
    </div>
    <blockquote type="cite"
      cite="mid:[email-masked]">
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style="mso-margin-top-alt:6.0pt;margin-right:0in;margin-bottom:6.0pt;margin-left:0in;background:white"><span
style="font-size:10.5pt;font-family:&quot;Arial&quot;,sans-serif;color:#202122">From
            Wikipedia<o:p></o:p></span></p>
        <p
style="mso-margin-top-alt:6.0pt;margin-right:0in;margin-bottom:6.0pt;margin-left:0in;background:white"><span
style="font-size:10.5pt;font-family:&quot;Arial&quot;,sans-serif;color:#202122">A <b>tachometer</b> (<b>revolution-counter</b>, <b>tach</b>, <b>rev-counter</b>, <b>RPM
              gauge</b>) is an instrument measuring the rotation speed
            of a <a href="https://en.wikipedia.org/wiki/Axle"
              title="Axle" moz-do-not-send="true"><span
                style="color:#3366CC;text-decoration:none">shaft</span></a> or
            disk, as in a motor or other machine.</span><sup
            id="cite_ref-1"><span
style="font-size:8.5pt;font-family:&quot;Arial&quot;,sans-serif;color:#202122"><a
href="https://en.wikipedia.org/wiki/Tachometer#cite_note-1"
                moz-do-not-send="true"><span
                  style="color:#3366CC;text-decoration:none">[1]</span></a></span></sup><span
style="font-size:10.5pt;font-family:&quot;Arial&quot;,sans-serif;color:#202122"> The
            device usually displays the <a
              href="https://en.wikipedia.org/wiki/Revolutions_per_minute"
              title="Revolutions per minute" moz-do-not-send="true"><span
                style="color:#3366CC;text-decoration:none">revolutions
                per minute</span></a> (RPM) on a calibrated analogue
            dial, but digital displays are increasingly common.</span><span
style="font-size:10.5pt;font-family:&quot;Arial&quot;,sans-serif;color:#202122"><o:p></o:p></span></p>
        <p
style="mso-margin-top-alt:6.0pt;margin-right:0in;margin-bottom:6.0pt;margin-left:0in;background:white;font-variant-ligatures:
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          2;text-align:start;widows: 2;-webkit-text-stroke-width:
          0px;text-decoration-thickness: initial;text-decoration-style:
          initial;text-decoration-color: initial;word-spacing:0px"> <span
style="font-size:10.5pt;font-family:&quot;Arial&quot;,sans-serif;color:#202122">The
            word comes from <a
              href="https://en.wikipedia.org/wiki/Greek_language"
              title="Greek language" moz-do-not-send="true"><span
                style="color:#3366CC;text-decoration:none">Greek</span></a> τάχος (<i>táchos</i> "speed")
            and μέτρον (<i>métron</i> "measure"). Essentially the words
            tachometer and <a
              href="https://en.wikipedia.org/wiki/Speedometer"
              title="Speedometer" moz-do-not-send="true"><span
                style="color:#3366CC;text-decoration:none">speedometer</span></a> have
            identical meaning: a device that measures speed. It is by
            arbitrary convention that in the automotive world one is
            used for engine revolutions and the other for vehicle speed.
            In formal engineering nomenclature, more precise terms are
            used to distinguish the two.<o:p></o:p></span></p>
        <p class="MsoNormal"><o:p> </o:p></p>
        <p class="MsoNormal">From dictionary.com<o:p></o:p></p>
        <p class="MsoNormal"
          style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><b><span
style="font-size:36.0pt;font-family:&quot;Arial&quot;,sans-serif">tachometer<o:p></o:p></span></b></p>
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            style="font-size:13.5pt;font-family:&quot;Arial&quot;,sans-serif">[
            ta-<b>kom</b>-i-ter, t<i>uh</i>- ]</span><span
            style="font-family:&quot;Arial&quot;,sans-serif">SHOW IPA<o:p></o:p></span></p>
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style="font-size:13.5pt;font-family:&quot;Arial&quot;,sans-serif;color:black">noun</span></i><span
style="font-size:13.5pt;font-family:&quot;Arial&quot;,sans-serif;color:black"><o:p></o:p></span></p>
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          <li class="MsoNormal" style="color:black;mso-list:l0 level1
            lfo1"><span
              style="font-size:13.5pt;font-family:&quot;Arial&quot;,sans-serif">any
              of various instruments for measuring or indicating
              velocity or speed, as of a machine, a river, or the blood.<o:p></o:p></span></li>
          <li class="MsoNormal" style="color:black;mso-list:l0 level1
            lfo1"><span
              style="font-size:13.5pt;font-family:&quot;Arial&quot;,sans-serif">an
              instrument measuring revolutions per minute, as of an
              engine.</span></li>
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From: Barney Gaylord <[email-masked]>
Date: Thu, 03 Aug 2023 12:43:52 -0500

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I dunno abott that "formal engineering 
nomenclature" stuff.  I'm an engineer, and in my 
world "rev counter" may be the British (English) 
term for a tachometer, but otherwise rev counter 
and tachometer are the same thing in the 
automotive world, regardless of the type of signal input.

Just for reference, here are examples of dozens 
of tachometers, many mechanically driven and 
having nothing to do with ignition systems or any kind of electrical input:=

https://duckduckgo.com/?q=3Dhand+tachometer&iax=3Dimages&ia=3Dimages&iai=3D=
https%3A%2F%2Fwww.cetm.com.sg%2F1534-superlarge_default%2Facision-tm1100-ha=
nd-held-tachometer.jpg&t=3Dffab

At 02:44 AM 8/3/2023, Paul Hunt wrote:
>....
>Both those are describing the function of the 
>instrument which is the same in both cases and 
>is not the point in question. Even so the first 
>definition includes the statement "In formal 
>engineering nomenclature, more precise terms are used to distinguish the t=
wo.".
>
>The PO's question was how do I connect a 
>_tachometer_ , and the answer to that is 
>fundamentally different to a rev counter. rev 
>counter displays the rate at which a cable drive 
>is turning, a tachometer measures the time 
>between successive electrical pulses. In the rev 
>counter case it doesn't matter whether it is on 
>a 4, 6 or 8 (etc.) cylinder whereas for a 
>tachometer the pulses from an 8 cylinder engine 
>are coming in at twice the rate of a 4-cylinder 
>and there have to be _internal_ differences in 
>the tachometer to display that correctly. If the 
>terms are used interchangeably then when 
>responding to a (formal engineering?) question 
>you would first have to establish which one is being talked about!
>
>PaulH.

>>A tachometer (revolution-counter, tach, 
>>rev-counter, RPM gauge) is an instrument 
>>measuring the rotation speed of a 
>><https://en.wikipedia.org/wiki/Axle>shaft or 
>>disk, as in a motor or other 
>>machine.<https://en.wikipedia.org/wiki/Tachometer#cite_note-1>[1] 
>>The device usually displays the 
>><https://en.wikipedia.org/wiki/Revolutions_per_minute>revolutions 
>>per 
>><https://en.wikipedia.org/wiki/Revolutions_per_minute>minute 
>>(RPM) on a calibrated analogue dial, but 
>>digital displays are increasingly common.
>>
>>The word comes from 
>><https://en.wikipedia.org/wiki/Greek_language>Greek 
>>=CF=84=CE=AC=CF=87=CE=BF=CF=82 (t=A1chos "speed") and =CE=BC=CE=AD=CF=84=
=CF=81=CE=BF=CE=BD 
>>(m=C3=A9tron "measure"). Essentially the words 
>>tachometer and 
>><https://en.wikipedia.org/wiki/Speedometer>speedometer 
>>have identical meaning: a device that measures 
>>speed. It is by arbitrary convention that in 
>>the automotive world one is used for engine 
>>revolutions and the other for vehicle speed. In 
>>formal engineering nomenclature, more precise 
>>terms are used to distinguish the two.
>>
>> From dictionary.com
>>
>>tachometer
>>
>>[ ta-kom-i-ter, tuh- ]SHOW IPA
>>
>>----------
>>noun
>>    * any of various instruments for measuring 
>> or indicating velocity or speed, as of a machine, a river, or the blood.=

>>    * an instrument measuring revolutions per minute, as of an engine.

-- 
This email has been checked for viruses by AVG antivirus software.
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<html>
<body>
<font size=3D3>I dunno abott that &quot;formal engineering
nomenclature&quot; stuff.&nbsp; I'm an engineer, and in my world
&quot;rev counter&quot; may be the British (English) term for a
tachometer, but otherwise rev counter and tachometer are the same thing
in the automotive world, regardless of the type of signal input.<br><br>
Just for reference, here are examples of dozens of tachometers, many
mechanically driven and having nothing to do with ignition systems or any
kind of electrical input:<br>
<a href=3D"https://duckduckgo.com/?q=3Dhand+tachometer&amp;iax=3Dimages&amp=
;ia=3Dimages&amp;iai=3Dhttps%3A%2F%2Fwww.cetm.com.sg%2F1534-superlarge_defa=
ult%2Facision-tm1100-hand-held-tachometer.jpg&amp;t=3Dffab" eudora=3D"autou=
rl">
https://duckduckgo.com/?q=3Dhand+tachometer&amp;iax=3Dimages&amp;ia=3Dimage=
s&amp;iai=3Dhttps%3A%2F%2Fwww.cetm.com.sg%2F1534-superlarge_default%2Facisi=
on-tm1100-hand-held-tachometer.jpg&amp;t=3Dffab<br>
<br>
<br>
</a>At 02:44 AM 8/3/2023, Paul Hunt wrote:<br>
<blockquote type=3Dcite class=3Dcite cite=3D"">....<br>
Both those are describing the function of the instrument which is the
same in both cases and is not the point in question. Even so the first
definition includes the statement &quot;In formal engineering
nomenclature, more precise terms are used to distinguish the
two.&quot;.<br><br>
The PO's question was how do I connect a _tachometer_ , and the answer to
that is fundamentally different to a rev counter. rev counter displays
the rate at which a cable drive is turning, a tachometer measures the
time between successive electrical pulses. In the rev counter case it
doesn't matter whether it is on a 4, 6 or 8 (etc.) cylinder whereas for a
tachometer the pulses from an 8 cylinder engine are coming in at twice
the rate of a 4-cylinder and there have to be _internal_ differences in
the tachometer to display that correctly. If the terms are used
interchangeably then when responding to a (formal engineering?) question
you would first have to establish which one is being talked
about!<br><br>
PaulH.</blockquote><br><br>
<blockquote type=3Dcite class=3Dcite cite=3D"">On 02/08/2023 14:29, dave
northrup wrote:<br>
<blockquote type=3Dcite class=3Dcite cite=3D""><br>
 From Wikipedia<br><br>
A <b>tachometer</b> (<b>revolution-counter</b>, <b>tach</b>,
<b>rev-counter</b>, <b>RPM gauge</b>) is an instrument measuring the
rotation speed of a
<a href=3D"https://en.wikipedia.org/wiki/Axle">shaft</a> or disk, as in a
motor or other
machine.<a href=3D"https://en.wikipedia.org/wiki/Tachometer#cite_note-1">
<sup>[1]</a></sup> The device usually displays the
<a href=3D"https://en.wikipedia.org/wiki/Revolutions_per_minute">
revolutions</a> per
<a href=3D"https://en.wikipedia.org/wiki/Revolutions_per_minute">minute</a>=

(RPM) on a calibrated analogue dial, but digital displays are
increasingly common.<br><br>
The word comes from
<a href=3D"https://en.wikipedia.org/wiki/Greek_language">Greek</a>
=CF=84=CE=AC=CF=87=CE=BF=CF=82 (<i>t=A1chos</i> &quot;speed&quot;) and =CE=
=BC=CE=AD=CF=84=CF=81=CE=BF=CE=BD
(<i>m=C3=A9tron</i> &quot;measure&quot;). Essentially the words tachometer
and <a href=3D"https://en.wikipedia.org/wiki/Speedometer">speedometer</a>
have identical meaning: a device that measures speed. It is by arbitrary
convention that in the automotive world one is used for engine
revolutions and the other for vehicle speed. In formal engineering
nomenclature, more precise terms are used to distinguish the
two.<br><br>
 From dictionary.com<br><br>
<b>tachometer<br>
</b><br>
[ ta-<b>kom</b>-i-ter, t<i>uh</i>- ]SHOW IPA<br>
<hr>
<i>noun</i> 
<ol>
<li>any of various instruments for measuring or indicating velocity or
speed, as of a machine, a river, or the blood. 
<li>an instrument measuring revolutions per minute, as of an engine.
</font>
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