I just bought my first Ferrari, a 1978 U.S. Version 308GTB, just last March 2003. When the car was sold to me, the speedometer was working. Then when the 308 was in my possession, the Speedometer just stopped functioning. That's when I noticed that the odometer was stuck with the same mileage that was on it even before I bought the car. Once, when the car was on neutral and left at idle, the speedometer needle just went up slowly by itself as if it was a tachometer. The needle rose to the 80mph mark then slowly went down to Zero. It has not functioned ever since. Thinking there was a ground, I had the speedo checked. They didn't find anything wrong with it so they said it might be the speedo sensor. I bought a NEW speedo sensor, to no avail. My speedo is still as dead as ever ! What should I do ? Buy a new speedometer ?