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September 29th, 2008

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Q & A: Jumping Tach

Tuesday December 23rd, 2008
Q & A, MGA, MGB, MGC, MG T-Type, Midget
As the Subject title indicates, my 1966 MGB has a mad jumping needle on the Tacho.

The car has been converted to neg earth and the tacho has been working fine before now.

Firstly, as I turn the ignition the needle jumps right up to the max rpm. The needle after running for 5 minutes slowly comes down, firstly indicating a minus reading, when you rev the car, the needle flicks backwards towards 0rpm.

Then after another 5 mins, it starts to read as it should. It's as though the polarity is self fixing, although as I said, it has worked fine before now.

A bloody gremlin has got in!

Have you seen or heard of such a thing before?
I wonder if you are using the standard 25D distributor, with points,
or, if you are using a more modern electronic ignition. Some of the
electronic ignitions cause odd readings on the tachometer.

If you are using ... read more