[Mgs] mga 1500 with early 5 main mgb engine

[dave northrup]

I do not know the origins of the tach.  I have no idea what is inside it and I have not taken it apart.  The car came to me in kit form.  I don’t really even know if the tach worked.  Any way to test it?

I do know that with the tach hooked up the engine runs, so power is at least going through it.   this is the only source of power for the coil.  Anyone have an mgb electic tach to sell?  I’d like to hook up something that is a known quantity.

From: Mgs <mgs-bounces at autox.team.net> On Behalf Of Max Heim
Sent: Sunday, July 30, 2023 7:53 PM
To: mgs at autox.team.net
Subject: Re: [Mgs] mga 1500 with early 5 main mgb engine

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 with a cheap auto parts store mini-tach inside the case. The only modifications 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 brass 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 <dave at ranteer.com<mailto:dave at ranteer.com>> 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>_______________________________________________

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