my tach needle is jumpy as hell like its on speed or crack or something .now i recently changed my motor from an 88is to a lower mileage 87i motor and i was wondering if there was a remedy to this. ive had this problem before but it went away after about a week but ive clocked 658 miles since the swap and the problem hasnt gone away or gotten any better. can anyone offer any advice as to how to fix this?
