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Re: [Mgs] MGB electric tach

To: dave northrup <dave@ranteer.com>
Subject: Re: [Mgs] MGB electric tach
From: Max Heim <mvheim@sonic.net>
Date: Wed, 23 Oct 2024 17:39:00 -0700
Cc: "<mgs@autox.team.net>" <mgs@autox.team.net>
Delivered-to: mharc@autox.team.net
Delivered-to: mgs@autox.team.net
References: <89803e9211ea4522996ef8c99f33df2b@ranteer.com> <8A7A0B28-38F8-4A61-B0CC-01646E742355@sonic.net> <1fae276ab3b0450ca7673cdbaeaedb2a@ranteer.com> <58C97ACC-4AB7-4EEE-9AD1-09E40B273366@sonic.net> <afd9ea2df8e0419ca838b6abfc2aaea0@ranteer.com>
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As you figured out, one white goes to =E2=80=9CL=E2=80=9D on the =
ignition switch, and the other to the coil +. Based on the overall =
alignment, I am going to say the left one goes to the switch and the =
right one to the coil.

The blade sticking out in the middle will be the ground to the case, =
which will be black.

That leaves the other blade as green to the voltage stabilizer.

FWIW...

--
Max Heim
'66 MGB

> On Oct 23, 2024, at 4:19=E2=80=AFPM, dave northrup <dave@ranteer.com> =
wrote:
>=20
> The wiring diagram shows 4 connections to the back of the tach.  I =
have found nothing which shows which goes to which.  I guess I can =
assume that the diagram is looking at the back of the tach but that=E2=80=99=
s as much detail as it shows.
> =20
> From: Max Heim <mvheim@sonic.net>=20
> Sent: Wednesday, October 23, 2024 6:14 PM
> To: dave northrup <dave@ranteer.com>
> Cc: <mgs@autox.team.net> <mgs@autox.team.net>
> Subject: Re: [Mgs] MGB electric tach
> =20
> 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.
> =20
> --
> Max Heim
> '66 MGB=20
> =20
> =20
>=20
>=20
> On Oct 23, 2024, at 3:25=E2=80=AFPM, dave northrup <dave@ranteer.com =
> =20
> Thank you for taking the time to answer=20
> =20
> =20
> -------- Original message --------
> Date: 10/23/24 3:23 PM (GMT-06:00)=20
> Subject: Re: [Mgs] MGB electric tach=20
> =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
>=20
>=20
> On Oct 23, 2024, at 12:25=E2=80=AFPM, dave northrup <dave@ranteer.com =
> =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
> Unsubscribe: =
http://autox.team.net/mailman/options/mgs/mvheim@sonic.net


--Apple-Mail=_E61B186F-5CA6-4BFA-9244-15D2DF2B576D
Content-Transfer-Encoding: quoted-printable
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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;"><div><br></div>As you figured out, one white goes to =
=E2=80=9CL=E2=80=9D on the ignition switch, and the other to the coil +. =
Based on the overall alignment, I am going to say the left one goes to =
the switch and the right one to the coil.<div><br></div><div>The blade =
sticking out in the middle will be the ground to the case, which will be =
black.</div><div><br></div><div>That leaves the other blade as green to =
the voltage stabilizer.</div><div><br></div><div>FWIW...<br><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 4:19=E2=80=AFP=
M, 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;">The wiring diagram shows 4 =
connections to the back of the tach.&nbsp; I have found nothing which =
shows which goes to which.&nbsp; I guess I can assume that the diagram =
is looking at the back of the tach but that=E2=80=99s as much detail as =
it shows.<o:p></o:p></div><div style=3D"margin: 0in; font-size: 11pt; =
font-family: Calibri, sans-serif;"><o:p>&nbsp;</o:p></div><div><div =
style=3D"border-width: 1pt medium medium; border-style: solid none none; =
border-color: rgb(225, 225, 225) currentcolor currentcolor; =
border-image: none; padding: 3pt 0in 0in;"><div style=3D"margin: 0in; =
font-size: 11pt; font-family: Calibri, sans-serif;"><b>From:</b><span =
class=3D"Apple-converted-space">&nbsp;</span>Max Heim =
&lt;mvheim@sonic.net&gt;<span =
class=3D"Apple-converted-space">&nbsp;</span><br><b>Sent:</b><span =
class=3D"Apple-converted-space">&nbsp;</span>Wednesday, October 23, 2024 =
6:14 PM<br><b>To:</b><span =
class=3D"Apple-converted-space">&nbsp;</span>dave northrup =
&lt;dave@ranteer.com&gt;<br><b>Cc:</b><span =
class=3D"Apple-converted-space">&nbsp;</span>&lt;mgs@autox.team.net&gt; =
&lt;mgs@autox.team.net&gt;<br><b>Subject:</b><span =
class=3D"Apple-converted-space">&nbsp;</span>Re: [Mgs] MGB electric =
tach<o:p></o:p></div></div></div><div style=3D"margin: 0in; font-size: =
11pt; font-family: Calibri, sans-serif;"><o:p>&nbsp;</o:p></div><div =
style=3D"margin: 0in; font-size: 11pt; font-family: Calibri, =
sans-serif;">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.<o:p></o:p></div><div><div style=3D"margin: =
0in; font-size: 11pt; font-family: Calibri, =
sans-serif;"><o:p>&nbsp;</o:p></div><div><div style=3D"margin: 0in; =
font-size: 11pt; font-family: Calibri, sans-serif;">--<br>Max =
Heim<br>'66 MGB<span =
class=3D"Apple-converted-space">&nbsp;</span><o:p></o:p></div></div><div><=
div style=3D"margin: 0in; font-size: 11pt; font-family: Calibri, =
sans-serif;"><o:p>&nbsp;</o:p></div></div><div><div style=3D"margin: =
0in; font-size: 11pt; font-family: Calibri, =
sans-serif;"><o:p>&nbsp;</o:p></div></div><div><div style=3D"margin: =
0in; font-size: 11pt; font-family: Calibri, =
sans-serif;"><br><br><o:p></o:p></div><blockquote style=3D"margin-top: =
5pt; margin-bottom: 5pt;"><div><div style=3D"margin: 0in; font-size: =
11pt; font-family: Calibri, sans-serif;">On Oct 23, 2024, at 3:25=E2=80=AF=
PM, dave northrup &lt;<a href=3D"mailto:dave@ranteer.com"; style=3D"color: =
blue; text-decoration: underline;">dave@ranteer.com</a>&gt; =
wrote:<o:p></o:p></div></div><div style=3D"margin: 0in; font-size: 11pt; =
font-family: Calibri, sans-serif;"><o:p>&nbsp;</o:p></div><div><div><div =
style=3D"margin: 0in; font-size: 11pt; font-family: Calibri, =
sans-serif;">Thank you for taking the time to answer<span =
class=3D"Apple-converted-space">&nbsp;</span><o:p></o:p></div><div><div =
style=3D"margin: 0in; font-size: 11pt; font-family: Calibri, =
sans-serif;"><o:p>&nbsp;</o:p></div></div><div><div style=3D"margin: =
0in; font-size: 11pt; font-family: Calibri, =
sans-serif;"><o:p>&nbsp;</o:p></div></div><div><div style=3D"margin: =
0in; font-size: 11pt; font-family: Calibri, sans-serif;">-------- =
Original message --------<o:p></o:p></div></div><div><div style=3D"margin:=
 0in; font-size: 11pt; font-family: Calibri, sans-serif;">From: Max Heim =
&lt;<a href=3D"mailto:mvheim@sonic.net"; style=3D"color: blue; =
text-decoration: =
underline;">mvheim@sonic.net</a>&gt;<o:p></o:p></div></div><div><div =
style=3D"margin: 0in; font-size: 11pt; font-family: Calibri, =
sans-serif;">Date: 10/23/24 3:23 PM (GMT-06:00)<span =
class=3D"Apple-converted-space">&nbsp;</span><o:p></o:p></div></div><div><=
div style=3D"margin: 0in; font-size: 11pt; font-family: Calibri, =
sans-serif;">To:<span class=3D"Apple-converted-space">&nbsp;</span><a =
href=3D"mailto:mgs@autox.team.net"; style=3D"color: blue; =
text-decoration: =
underline;">mgs@autox.team.net</a><o:p></o:p></div></div><div><div =
style=3D"margin: 0in; font-size: 11pt; font-family: Calibri, =
sans-serif;">Cc: dave northrup &lt;<a href=3D"mailto:dave@ranteer.com"; =
style=3D"color: blue; text-decoration: =
underline;">dave@ranteer.com</a>&gt;<o:p></o:p></div></div><div><div =
style=3D"margin: 0in; font-size: 11pt; font-family: Calibri, =
sans-serif;">Subject: Re: [Mgs] MGB electric tach<span =
class=3D"Apple-converted-space">&nbsp;</span><o:p></o:p></div></div><div><=
div style=3D"margin: 0in; font-size: 11pt; font-family: Calibri, =
sans-serif;"><o:p>&nbsp;</o:p></div></div><div><div style=3D"margin: =
0in; font-size: 11pt; font-family: Calibri, sans-serif;">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.<o:p></o:p></div><div><div style=3D"margin: 0in; =
font-size: 11pt; font-family: Calibri, =
sans-serif;"><o:p>&nbsp;</o:p></div><div><div style=3D"margin: 0in; =
font-size: 11pt; font-family: Calibri, sans-serif;">--<br>Max =
Heim<br>'66 MGB<span =
class=3D"Apple-converted-space">&nbsp;</span><o:p></o:p></div></div><div><=
div style=3D"margin: 0in; font-size: 11pt; font-family: Calibri, =
sans-serif;"><br><br><o:p></o:p></div><blockquote style=3D"margin-top: =
5pt; margin-bottom: 5pt;"><div><div style=3D"margin: 0in; font-size: =
11pt; font-family: Calibri, sans-serif;">On Oct 23, 2024, at 12:25=E2=80=AF=
PM, dave northrup &lt;<a href=3D"mailto:dave@ranteer.com"; style=3D"color: =
blue; text-decoration: underline;">dave@ranteer.com</a>&gt; =
wrote:<o:p></o:p></div></div><div style=3D"margin: 0in; font-size: 11pt; =
font-family: Calibri, =
sans-serif;"><o:p>&nbsp;</o:p></div><div><div><div><div style=3D"margin: =
0in; font-size: 11pt; font-family: Calibri, sans-serif;">Working on an =
MGA with a swapped in early 5 main MGB =
engine.<o:p></o:p></div></div><div><div style=3D"margin: 0in; font-size: =
11pt; font-family: Calibri, =
sans-serif;">&nbsp;<o:p></o:p></div></div><div><div style=3D"margin: =
0in; font-size: 11pt; font-family: Calibri, sans-serif;">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></div></div><div><div style=3D"margin: 0in; font-size: =
11pt; font-family: Calibri, =
sans-serif;">&nbsp;<o:p></o:p></div></div><div><div style=3D"margin: =
0in; font-size: 11pt; font-family: Calibri, sans-serif;">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></div></div><div><div style=3D"margin: 0in; font-size: =
11pt; font-family: Calibri, =
sans-serif;">&nbsp;<o:p></o:p></div></div><div><div style=3D"margin: =
0in; font-size: 11pt; font-family: Calibri, sans-serif;">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></div></div><div><div style=3D"margin: 0in; font-size: =
11pt; font-family: Calibri, =
sans-serif;">&nbsp;<o:p></o:p></div></div><div><div style=3D"margin: =
0in; font-size: 11pt; font-family: Calibri, sans-serif;">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></div></div></div><div style=3D"margin: =
0in; font-size: 11pt; font-family: Calibri, =
sans-serif;">&lt;20241022_175133.jpg&gt;<span style=3D"font-size: 10pt; =
font-family: Verdana, =
sans-serif;">_______________________________________________<br><br></span=
><a href=3D"mailto:Mgs@autox.team.net"; style=3D"color: blue; =
text-decoration: underline;"><span style=3D"font-size: 10pt; =
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