I have a 82 300D that had the engine/transmission replaced by the previous owner. The Odometer/Speedometer is erratic or non-working. Usually neither moves. Rarely the odometer rolls and speedometer bounces up to 10mph. Sometimes the trip odometer turn while idling in park. Does any one know if the speedometer/odometer and cable are the same in the 82 and the 80 300D. Basically how much of a mess did I get myself into? THanks Brent.