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Discussion Starter #1
well after my PI engine swap my factory tach seems to be doing some strange things...now i know factory tachs arent known for their superb accuracy but this thing is doing some real strange things one of which is when you are idling and then give it some gas the tach goes in reverse!?...it does similar stuff as you drive down the road too....is there some things i can check to trouble shoot it?...where is the connection on the engine?
 

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check your crank sensor wiring... did you reuse the thunderbird crank sensor and reloctor wheel?
 

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Discussion Starter #3 (Edited)
check your crank sensor wiring... did you reuse the thunderbird crank sensor and reloctor wheel?
well what we had to do was use the gm exciter wheel and the Tbird sensor..if not it wouldnt have lined up right...the spacer was built into the exciter wheel on the Tbird and on the GM engine the spacer was built into the crank gear....does it have something to do with that??...does the tach read off the crank sensor?
 
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