The history: was sent out to redo the face of my 6000rpm factory tach (on my S code tribute car) to an 8000rpm look-alike. I put in a Petronics II module in the distributor. Seems to only read a constant 500rpm. Kind of at a loss as to what the check.
Plus, can't send it to the best tach man we used to have any more if I need too.
Plus, can't send it to the best tach man we used to have any more if I need too.