Subject: Re: [Mgs] Mgs Digest, Vol 194, Issue 12

From: Eric Russell <[email-masked]>
Date: Mon, 31 Jul 2023 16:21:38 -0400

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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=E2=80=AFPM <[email-masked]> wrote:

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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 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?
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> ------------------------------
>
> 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 wit=
h
> a cheap auto parts store mini-tach inside the case. The only modification=
s
> 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 bra=
ss
> 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.htm=
l
> >
> > Suggested annual donation  $12.75
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> > Archive: http://www.team.net/pipermail/mgs <
> http://www.team.net/pipermail/mgs> http://autox.team.net/archive <
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> >
> > Unsubscribe: http://autox.team.net/mailman/options/mgs/[email-masked]
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> ------------------------------
>
> 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/archiv=
e
> >
> > Unsubscribe:
> http://autox.team.net/mailman/options/mgs/[email-masked]
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>
> Subject: Digest Footer
>
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> Mgs mailing list
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> ------------------------------
>
> End of Mgs Digest, Vol 194, Issue 12
> ************************************
>

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<div dir=3D"ltr"><div class=3D"gmail_default" style=3D"font-size:large">My =
guess is an MGA tach face (Jaeger) or perhaps MGA tach face &amp; case was =
used with a different tach&#39;s internals. MGB tachs were &#39;Smiths&#39;=
.=C2=A0</div><div class=3D"gmail_default" style=3D"font-size:large"><br></d=
iv><div class=3D"gmail_default" style=3D"font-size:large">MGB tach for MGA =
is described here:=C2=A0<a href=3D"http://mgaguru.com/mgtech/electric/et202=
c.htm">http://mgaguru.com/mgtech/electric/et202c.htm</a>=C2=A0</div><div cl=
ass=3D"gmail_default" style=3D"font-size:large"><br></div><div class=3D"gma=
il_default" style=3D"font-size:large">EjR=C2=A0</div></div><br><div class=
=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Mon, Jul 31, 2023=
 at 2:08=E2=80=AFPM &lt;<a href=3D"mailto:[email-masked]">mgs-r=
[email-masked]</a>&gt; wrote:<br></div><blockquote class=3D"gmail_qu=
ote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,20=
4);padding-left:1ex">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>
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<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=
=3D"_blank">http://www.team.net/archive</a><br>
Forums: <a href=3D"http://www.team.net/forums" rel=3D"noreferrer" target=3D=
"_blank">http://www.team.net/forums</a><br>
<br>
<br>
<br>
Today&#39;s Topics:<br>
<br>
=C2=A0 =C2=A01. mga 1500 with early 5 main mgb engine (dave northrup)<br>
=C2=A0 =C2=A02. Re: mga 1500 with early 5 main mgb engine (Max Heim)<br>
=C2=A0 =C2=A03. Re: mga 1500 with early 5 main mgb engine (Paul Hunt)<br>
<br>
<br>
----------------------------------------------------------------------<br>
<br>
Message: 1<br>
Date: Mon, 31 Jul 2023 00:22:55 +0000<br>
From: dave northrup &lt;<a href=3D"mailto:[email-masked]" target=3D"_blan=
k">[email-masked]</a>&gt;<br>
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"_bl=
ank">[email-masked]</a>&gt;<br>
Subject: [Mgs] mga 1500 with early 5 main mgb engine<br>
com" target=3D"_blank">[email-masked]</a>&gt;=
<br>
<br>
Negative ground, car runs smoothly, need to install the electric tach which=
 supposedly was previously installed in this car and working.<br>
<br>
On the back view, what hooks up where?=C2=A0 I am pretty sure the tab, and =
the screw, are ground.<br>
<br>
The other two - one needs to go to power and the other to the coil.=C2=A0 I=
 think one is a female bullet connector; the other is male.=C2=A0 Which goe=
s to power and which to the coil?<br>
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<br>
------------------------------<br>
<br>
Message: 2<br>
Date: Sun, 30 Jul 2023 17:52:40 -0700<br>
From: Max Heim &lt;<a href=3D"mailto:[email-masked]" target=3D"_blank">mv=
[email-masked]</a>&gt;<br>
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"_bl=
ank">[email-masked]</a>&gt;<br>
Subject: Re: [Mgs] mga 1500 with early 5 main mgb engine<br>
c.net" target=3D"_blank">[email-masked]</a>=
&gt;<br>
<br>
Hmm, the back of that tach case has obviously been modified. Are you sure i=
t still contains the matching internals? I say this because for 20 years I =
ran my Mk. I MGB with the original tach case, faceplate &amp; needle, but w=
ith a cheap auto parts store mini-tach inside the case. The only modificati=
ons were two small screw holes to attach the mechanism.<br>
<br>
An original MGB Mk. I tach would have had a loop in the white wire, attache=
d to the back of the case with a thumb nut and a thin U-shaped brass bracke=
t. I am not seeing that on yours.<br>
<br>
Actually, I guess it is unclear whether you are talking about an MGA tach o=
r an early MGB tach...<br>
<br>
--<br>
Max Heim<br>
&#39;66 MGB<br>
<br>
&gt; On Jul 30, 2023, at 5:22 PM, dave northrup &lt;<a href=3D"mailto:dave@=
ranteer.com" target=3D"_blank">[email-masked]</a>&gt; wrote:<br>
&gt; <br>
&gt; Negative ground, car runs smoothly, need to install the electric tach =
which supposedly was previously installed in this car and working.<br>
&gt;=C2=A0 <br>
&gt; On the back view, what hooks up where?=C2=A0 I am pretty sure the tab,=
 and the screw, are ground.<br>
&gt;=C2=A0 <br>
&gt; The other two ? one needs to go to power and the other to the coil.=C2=
=A0 I think one is a female bullet connector; the other is male.=C2=A0 Whic=
h goes to power and which to the coil?<br>
&gt; &lt;tach front view.jpg&gt;&lt;tach rear view.jpg&gt;_________________=
______________________________<br>
&gt; <br>
&gt; <a href=3D"mailto:[email-masked]" target=3D"_blank">[email-masked]=
.net</a> &lt;mailto:<a href=3D"mailto:[email-masked]" target=3D"_blank"=
>[email-masked]</a>&gt;<br>
&gt; Donate: <a href=3D"http://www.team.net/donate.html" rel=3D"noreferrer"=
 target=3D"_blank">http://www.team.net/donate.html</a> &lt;<a href=3D"http:=
//www.team.net/donate.html" rel=3D"noreferrer" target=3D"_blank">http://www=
.team.net/donate.html</a>&gt;<br>
&gt; Suggested annual donation=C2=A0 $12.75<br>
&gt; <br>
&gt; Archive: <a href=3D"http://www.team.net/pipermail/mgs" rel=3D"noreferr=
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<br>
------------------------------<br>
<br>
Message: 3<br>
Date: Mon, 31 Jul 2023 08:38:26 +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] mga 1500 with early 5 main mgb engine<br>
l.com" target=3D"_blank">[email-masked]</a>=
&gt;<br>
d&quot;<br>
<br>
Not an MGB reference number, it looks like it has later internals than <br>
but would still be the current-operated type i.e. RVI where the power to <b=
r>
the coil comes via the tach.? The ignition switch would be connected to <br=
the male bullet and the female bullet to the coil.? 12v (also from the <br>
ignition) to the spade and earth to the case.? When used on the MGB <br>
there were separate wires from the ignition switch to the spade and to <br>
the male bullet but you can tee from one to the other rather than <br>
running a separate wire.<br>
<br>
It would have been helpful to see the top half of the dial where it <br>
might have shown RVI and what polarity it was.? I suspect it would show <br=
positive earth, but those electronics would have been used with negative <b=
r>
earth in an MGB for example so it looks like it has been converted by <br>
swapping the guts instead of swapping the wires round internally.? If <br>
that tach was used after the car was converted to negative earth it <br>
would make sense.<br>
<br>
PaulH.<br>
<br>
On 31/07/2023 01:22, dave northrup wrote:<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?? I am pretty sure the tab, and =
<br>
&gt; the screw, are ground.<br>
&gt;<br>
&gt; The other two ? one needs to go to power and the other to the coil.? I=
 <br>
&gt; think one is a female bullet connector; the other is male.? Which goes=
 <br>
&gt; to power and which to the coil?<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" =
target=3D"_blank">http://www.team.net/donate.html</a><br>
&gt; Suggested annual donation=C2=A0 $12.75<br>
&gt;<br>
&gt; Archive:<a href=3D"http://www.team.net/pipermail/mgs" rel=3D"noreferre=
r" target=3D"_blank">http://www.team.net/pipermail/mgs</a>=C2=A0 <a href=3D=
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<br>
------------------------------<br>
<br>
Subject: Digest Footer<br>
<br>
_______________________________________________<br>
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------------------------------<br>
<br>
End of Mgs Digest, Vol 194, Issue 12<br>
************************************<br>
</blockquote></div>

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