1995 Ram 2500 CumminsTD, speedometer is reading approximately double what the actual speed is (eg: truck going 100km/hr, speedometer reading 200km/hr) I have replaced the speedo gear in the transfer case, made sure to index properly based on 31 teeth on the gear, tried a brand new speed sensor and still same issue. The truck shifts into overdrive normally and the odometer record distance correctly, it's just seems to be the speedometer. Could it be that I need to have the computer re-flashed/reset? Any ideas would be great!