Subject: [Mgs] MGB electric tach

From: dave northrup <[email-masked]>
Date: Wed, 23 Oct 2024 19:25:55 +0000

--_004_89803e9211ea4522996ef8c99f33df2branteercom_
	boundary="_000_89803e9211ea4522996ef8c99f33df2branteercom_"

--_000_89803e9211ea4522996ef8c99f33df2branteercom_
Content-Transfer-Encoding: quoted-printable

Working on an MGA with a swapped in early 5 main MGB engine.

Trying to figure out how to set up an electric tach.  With the car came an =
MGA tach with the internals swapped for an MGB tach but it doesn't work.  I=
 purchased an MGB tach, and am trying to test it before I attempt to swap t=
he internals for the non working one.

Here is a picture of the tach; there are 2 white leads, which according to =
the wiring diagram, one goes to the coil and one to the ignition.  Which is=
 which?  Or should I just try them?  I know that it goes power to tach to c=
oil.  We had the car running with the old tach but no movement of the needl=
e before we found out that the gage was bad.

Also, I am assuming the extra spade in the tach goes to power?  At least th=
e ground spade is obvious as its part of the case.

And, while I'm at it, the MGB wiring diagram shows one lead to the gage vol=
tage stabilizer.  I'm thinking that can go directly to the fuse box to powe=
r?

--_000_89803e9211ea4522996ef8c99f33df2branteercom_
Content-Transfer-Encoding: quoted-printable

<html xmlns:v=3D"urn:schemas-microsoft-com:vml" xmlns:o=3D"urn:schemas-micr=
osoft-com:office:office" xmlns:w=3D"urn:schemas-microsoft-com:office:word" =
xmlns:m=3D"http://schemas.microsoft.com/office/2004/12/omml" xmlns=3D"http:=
//www.w3.org/TR/REC-html40">
<head>
<meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3Dus-ascii"=
<meta name=3D"Generator" content=3D"Microsoft Word 15 (filtered medium)">
<style><!--
/* Font Definitions */
@font-face
	{font-family:"Cambria Math";
	panose-1:2 4 5 3 5 4 6 3 2 4;}
@font-face
	{font-family:Calibri;
	panose-1:2 15 5 2 2 2 4 3 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
	{margin:0in;
	font-size:11.0pt;
	font-family:"Calibri",sans-serif;
	mso-ligatures:standardcontextual;}
span.EmailStyle17
	{mso-style-type:personal-compose;
	font-family:"Calibri",sans-serif;
	color:black;}
.MsoChpDefault
	{mso-style-type:export-only;
	font-family:"Calibri",sans-serif;}
@page WordSection1
	{size:8.5in 11.0in;
	margin:1.0in 1.0in 1.0in 1.0in;}
div.WordSection1
	{page:WordSection1;}
--></style><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext=3D"edit" spidmax=3D"1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext=3D"edit">
<o:idmap v:ext=3D"edit" data=3D"1" />
</o:shapelayout></xml><![endif]-->
</head>
<body lang=3D"EN-US" link=3D"#0563C1" vlink=3D"#954F72" style=3D"word-wrap:=
break-word">
<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span style=3D"color:black">Working on an MGA with a=
 swapped in early 5 main MGB engine.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:black"><o:p>&nbsp;</o:p></span>=
</p>
<p class=3D"MsoNormal"><span style=3D"color:black">Trying to figure out how=
 to set up an electric tach.&nbsp; With the car came an MGA tach with the i=
nternals swapped for an MGB tach but it doesn&#8217;t work.&nbsp; I purchas=
ed an MGB tach, and am trying to test it before I attempt
 to swap the internals for the non working one.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:black"><o:p>&nbsp;</o:p></span>=
</p>
<p class=3D"MsoNormal"><span style=3D"color:black">Here is a picture of the=
 tach; there are 2 white leads, which according to the wiring diagram, one =
goes to the coil and one to the ignition.&nbsp; Which is which?&nbsp; Or sh=
ould I just try them?&nbsp; I know that it goes power
 to tach to coil.&nbsp; We had the car running with the old tach but no mov=
ement of the needle before we found out that the gage was bad.<o:p></o:p></=
span></p>
<p class=3D"MsoNormal"><span style=3D"color:black"><o:p>&nbsp;</o:p></span>=
</p>
<p class=3D"MsoNormal"><span style=3D"color:black">Also, I am assuming the =
extra spade in the tach goes to power?&nbsp; At least the ground spade is o=
bvious as its part of the case.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:black"><o:p>&nbsp;</o:p></span>=
</p>
<p class=3D"MsoNormal"><span style=3D"color:black">And, while I&#8217;m at =
it, the MGB wiring diagram shows one lead to the gage voltage stabilizer.&n=
bsp; I&#8217;m thinking that can go directly to the fuse box to power?<o:p>=
</o:p></span></p>
</div>
</body>
</html>

--_000_89803e9211ea4522996ef8c99f33df2branteercom_--

--_004_89803e9211ea4522996ef8c99f33df2branteercom_
Content-Description: 20241022_175133.jpg
Content-Disposition: attachment; filename="20241022_175133.jpg"; size=2718237;
	creation-date="Wed, 23 Oct 2024 14:25:26 GMT";
	modification-date="Wed, 23 Oct 2024 19:25:54 GMT"
Content-Transfer-Encoding: base64

AAAAoQoTAAAAEwAAACQAAABTRUZU

--_004_89803e9211ea4522996ef8c99f33df2branteercom_
Content-Transfer-Encoding: 7bit
Content-Disposition: inline

_______________________________________________

[email-masked]

Archive: http://www.team.net/pipermail/mgs http://autox.team.net/archive

Unsubscribe: http://autox.team.net/mailman/options/mgs/[email-masked]

--_004_89803e9211ea4522996ef8c99f33df2branteercom_--