Tach & speedometer both pegged

1990 Pontiac Trans sport. New vehicle speed sensor installed, new wiring and connector. New coil & disgtributor

Are the other gauges readings accurate?
Not sure if what I have will be of much help, my manual is for 1995, cant say what differences there would be for your 1990 model.
Jeff

Yes, voltmeter, oil pressure and coolant temp. are all working accurately.

Ron:
E mail me at jeffb at ontera.net and I will send you a scan from my manual.
Good luck
Jeff