I put a 1993 Cheyenne cab on a 1991 Silverado frame with a 350 engine everything hooked up correctly except for the speedometer, the only wiring difference was three wires from the sensor on transmission, V8 all wires went to the ECU, on the Cheyenne there is a plug outside the ECU with the wires from transmission. How can I hook this up to make the speedometer and odometer work?