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					Originally Posted by phatdaddy  anytime i had a tach go bad, it went to zero, erratic readings usually was a symptom of other problemshe should have a shop tach to just hook the wires up and see if the problem goes away
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I agree w/PD here big time...shop tach time for sure...and I gotta tell ya...if that mechanic can't find a tach to fit, I'd be lookin' for a new mechanic...they are a standard size and have been forever...