how do i installafter market tachc in a first gen
How would i install a after market tach in a 82 gsl also i put a 67 dart altinater on it my boy mo wired it up its working but the voltameter is jumping around any ideas would help hit me up
Search engine is your friend. 
This thread should help.
https://www.rx7club.com/showthread.p...ometer+install

This thread should help.
https://www.rx7club.com/showthread.p...ometer+install
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Turblown
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demetlaw
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