I recently replaced my original instrument cluster, as none of the gauges worked, with one i bought from classic Industries. After installing a new wiring harness(for the whole truck) we hooked up the cluster and the speedometer reads about 30 mph's faster than the correct speed. Any suggestion how i can calibrate this or at least get it closer to correct speed?
The Truck has a 350 small block with an automatic transmission that replaced the original 6 and 3 speed (this was done before i bought the truck).
