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Hello,

Have any of you had problems with your tach? I have a '90 coupe and the tach does not work. When you start the car it goes up past the highest reading and then drops down to below 0. It will move between those two spots occasionally, but never registers the true RPMS. I have been told it could be a tach filter. Is there any way to test a tach filter?
 

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I had the exact same problem and I had a loose wire on my distributer. On mine it was the white wire on the drivers side of the distributer.
 

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