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As far as I can tell, you have a 3.5=E2=80=9D diameter tach from a =
1968-up MGB. So you should probably look at the wiring diagram for one =
of these years. I don't have any personal experience because I deal =
strictly with pre-68 Bs.
--
Max Heim
'66 MGB
> On Oct 23, 2024, at 3:25=E2=80=AFPM, dave northrup <dave@ranteer.com> =
wrote:
>=20
> Thank you for taking the time to answer
>=20
>=20
> -------- Original message --------
> From: Max Heim <mvheim@sonic.net>
> Date: 10/23/24 3:23 PM (GMT-06:00)
> To: mgs@autox.team.net
> Cc: dave northrup <dave@ranteer.com>
> Subject: Re: [Mgs] MGB electric tach
>=20
> 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.
>=20
> --
> Max Heim
> '66 MGB
>=20
>> 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 =
http://autox.team.net/archive
>>=20
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http://autox.team.net/mailman/options/mgs/mvheim@sonic.net
>=20
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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;">As far as I =
can tell, you have a 3.5=E2=80=9D diameter tach from a 1968-up MGB. So =
you should probably look at the wiring diagram for one of these years. I =
don't have any personal experience because I deal strictly with pre-68 =
Bs.<div><br id=3D"lineBreakAtBeginningOfMessage"><div>
--<br>Max Heim<br>'66 MGB
</div><div><br></div><div><br></div>
<div><br><blockquote type=3D"cite"><div>On Oct 23, 2024, at 3:25=E2=80=AFP=
M, dave northrup <dave@ranteer.com> wrote:</div><br =
class=3D"Apple-interchange-newline"><div>
<meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3Dutf-8">
<meta content=3D"text/html; charset=3Dutf-8">
<div style=3D"line-break:after-white-space">
Thank you for taking the time to answer
<div><br>
</div>
<div><br>
</div>
<div>-------- Original message --------</div>
<div>From: Max Heim <mvheim@sonic.net> </div>
<div>Date: 10/23/24 3:23 PM (GMT-06:00) </div>
<div>To: mgs@autox.team.net </div>
<div>Cc: dave northrup <dave@ranteer.com> </div>
<div>Subject: Re: [Mgs] MGB electric tach </div>
<div><br>
</div>
<div>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=AFPM, dave northrup =
<dave@ranteer.com> wrote:</div>
<br class=3D"Apple-interchange-newline">
<div>
<div class=3D"WordSection1" style=3D"font-family:Verdana; =
font-size:13px; font-style:normal; font-weight:400; =
letter-spacing:normal; text-align:start; text-indent:0px; =
text-transform:none; white-space:normal; word-spacing: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.</span></div>
<div style=3D"margin:0in; font-size:11pt; =
font-family:Calibri,sans-serif"><span style=3D""> </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. 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.</span></div>
<div style=3D"margin:0in; font-size:11pt; =
font-family:Calibri,sans-serif"><span style=3D""> </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. 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.</span></div>
<div style=3D"margin:0in; font-size:11pt; =
font-family:Calibri,sans-serif"><span style=3D""> </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? At least the ground spade =
is obvious as its part of the case.</span></div>
<div style=3D"margin:0in; font-size:11pt; =
font-family:Calibri,sans-serif"><span style=3D""> </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. I=E2=80=99m thinking that can go directly to the fuse =
box to power?</span></div>
</div>
<span =
id=3D"cid:610EB38F-BE24-4926-844A-6AD792369EB8"><20241022_175133.jpg>=
;</span><span style=3D"font-family:Verdana; font-size:13px; =
font-style:normal; font-weight:400; letter-spacing:normal; =
text-align:start; text-indent:0px; text-transform:none; =
white-space:normal; word-spacing:0px; text-decoration:none; float:none; =
display:inline!important">_______________________________________________<=
/span><br style=3D"font-family:Verdana; font-size:13px; =
font-style:normal; font-weight:400; letter-spacing:normal; =
text-align:start; text-indent:0px; text-transform:none; =
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text-indent:0px; text-transform:none; white-space:normal; =
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display:inline!important">Donate:<span =
class=3D"Apple-converted-space"> </span></span><a =
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letter-spacing:normal; orphans:auto; text-align:start; text-indent:0px; =
text-transform:none; white-space:normal; widows:auto; =
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</blockquote>
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