I have a problem with my speedo and was wondering if anyone could help. I just bought a 1988 Mustang with a fresh rebuilt motor and T5 transmission. I drove the car about 40km and the speedo stopped working. I pulled the speedo gear out of the transmission, and it is all there. I then spun the gear and had a friend look at my speedometer and found that the speedometer will jump when the gear is spun. Can anyone tell me what is wrong and how to fix it ?