Question on a Tach

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Oct 17, 2011 | 01:47 PM

fontime

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Question on a Tach

I have a 1992 F-250, 460ci and the tach reads "0" with key on before starting. Immediately upon starting the Tach reads 2500 and stays there
never moves.
Any ideas would be greatly appreciated.
Roger

Oct 17, 2011 | 03:15 PM

Slowroll90

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Either it's faulty or not wired correctly. Is it factory or aftermarket?

Oct 17, 2011 | 04:44 PM

fontime

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It's factory. Never been touched to my knowledge. When you say faulty, you mean the gauge or the distributor or the wiring possibly?

Thanks for your input.
Roger

Oct 17, 2011 | 05:11 PM

Slowroll90

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Well if the distributor was messed up I doubt it would run
It could be the gauge itself has failed or maybe wiring
My tach is aftermarket so I'm not sure how the factory is wired but mine is wired to the negative of the coil
It obviously has power since it moves. But it's not getting signal