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Re: [Mgs] MGB electric tach

To: "mgs@autox.team.net" <mgs@autox.team.net>
Subject: Re: [Mgs] MGB electric tach
From: Max Heim <mvheim@sonic.net>
Date: Wed, 23 Oct 2024 13:23:21 -0700
Delivered-to: mharc@autox.team.net
Delivered-to: mgs@autox.team.net
References: <89803e9211ea4522996ef8c99f33df2b@ranteer.com>
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What year of MGB is this tach out of? It=E2=80=99s way too small for a =
Mk. I =E2=80=94 is it out of a pillow dash car? It also lacks the =
inductive loop that would be present on an early car. So this tach is =
certainly going to be negative earth.

--
Max Heim
'66 MGB

> On Oct 23, 2024, at 12:25=E2=80=AFPM, dave northrup <dave@ranteer.com> =
wrote:
>=20
> Working on an MGA with a swapped in early 5 main MGB engine.
> =20
> 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=E2=80=99t work.  I purchased an MGB tach, and am trying to test it =
before I attempt to swap the internals for the non working one.
> =20
> 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 coil.  We had the car running with the old tach =
but no movement of the needle before we found out that the gage was bad.
> =20
> Also, I am assuming the extra spade in the tach goes to power?  At =
least the ground spade is obvious as its part of the case.
> =20
> And, while I=E2=80=99m at it, the MGB wiring diagram shows one lead to =
the gage voltage stabilizer.  I=E2=80=99m thinking that can go directly =
to the fuse box to power?
> <20241022_175133.jpg>_______________________________________________
>=20
> Donate: http://www.team.net/donate.html
> Suggested annual donation  $12.75
>=20
> Archive: http://www.team.net/pipermail/mgs =
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http://autox.team.net/mailman/options/mgs/mvheim@sonic.net


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<html><head><meta http-equiv=3D"content-type" content=3D"text/html; =
charset=3Dutf-8"></head><body style=3D"overflow-wrap: break-word; =
-webkit-nbsp-mode: space; line-break: after-white-space;">What year of =
MGB is this tach out of? It=E2=80=99s way too small for a Mk. I =E2=80=94 =
is it out of a pillow dash car? It also lacks the inductive loop that =
would be present on an early car. So this tach is certainly going to be =
negative earth.<div><br id=3D"lineBreakAtBeginningOfMessage"><div>
--<br>Max Heim<br>'66 MGB

</div>

<div><br><blockquote type=3D"cite"><div>On Oct 23, 2024, at 12:25=E2=80=AF=
PM, dave northrup &lt;dave@ranteer.com&gt; wrote:</div><br =
class=3D"Apple-interchange-newline"><div><meta charset=3D"UTF-8"><div =
class=3D"WordSection1" style=3D"page: WordSection1; caret-color: rgb(0, =
0, 0); font-family: Verdana; font-size: 13px; font-style: normal; =
font-variant-caps: normal; font-weight: 400; letter-spacing: normal; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; =
text-decoration: none;"><div style=3D"margin: 0in; font-size: 11pt; =
font-family: Calibri, sans-serif;"><span style=3D"">Working on an MGA =
with a swapped in early 5 main MGB engine.<o:p></o:p></span></div><div =
style=3D"margin: 0in; font-size: 11pt; font-family: Calibri, =
sans-serif;"><span style=3D""><o:p>&nbsp;</o:p></span></div><div =
style=3D"margin: 0in; font-size: 11pt; font-family: Calibri, =
sans-serif;"><span style=3D"">Trying to figure out how to set up an =
electric tach.&nbsp; With the car came an MGA tach with the internals =
swapped for an MGB tach but it doesn=E2=80=99t work.&nbsp; I purchased =
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></div><div =
style=3D"margin: 0in; font-size: 11pt; font-family: Calibri, =
sans-serif;"><span style=3D""><o:p>&nbsp;</o:p></span></div><div =
style=3D"margin: 0in; font-size: 11pt; font-family: Calibri, =
sans-serif;"><span style=3D"">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 should 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 movement of the needle before =
we found out that the gage was bad.<o:p></o:p></span></div><div =
style=3D"margin: 0in; font-size: 11pt; font-family: Calibri, =
sans-serif;"><span style=3D""><o:p>&nbsp;</o:p></span></div><div =
style=3D"margin: 0in; font-size: 11pt; font-family: Calibri, =
sans-serif;"><span style=3D"">Also, I am assuming the extra spade in the =
tach goes to power?&nbsp; At least the ground spade is obvious as its =
part of the case.<o:p></o:p></span></div><div style=3D"margin: 0in; =
font-size: 11pt; font-family: Calibri, sans-serif;"><span =
style=3D""><o:p>&nbsp;</o:p></span></div><div style=3D"margin: 0in; =
font-size: 11pt; font-family: Calibri, sans-serif;"><span style=3D"">And, =
while I=E2=80=99m at it, the MGB wiring diagram shows one lead to the =
gage voltage stabilizer.&nbsp; I=E2=80=99m thinking that can go directly =
to the fuse box to power?<o:p></o:p></span></div></div><span =
id=3D"cid:610EB38F-BE24-4926-844A-6AD792369EB8">&lt;20241022_175133.jpg&gt=
;</span><span style=3D"caret-color: rgb(0, 0, 0); font-family: Verdana; =
font-size: 13px; font-style: normal; font-variant-caps: normal; =
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text-indent: 0px; text-transform: none; white-space: normal; =
word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: =
none; float: none; display: inline =
!important;">_______________________________________________</span><br =
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text-transform: none; white-space: normal; word-spacing: 0px; =
-webkit-text-stroke-width: 0px; text-decoration: none;"><a =
href=3D"mailto:Mgs@autox.team.net"; style=3D"font-family: Verdana; =
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