Mine did exactly the same and i also turned the car off and turned it back on after a while and everything was okJustice said:I've had a time or two where my speedo needle went wacko, bouncing all over the place while driving. Came to a stop and it said I was doing 80Mph. I turned the car off, sat for a few seconds then turned the car back on, and everything was ok. I've also had my engine temp warning go off and the needle jumped to the explode side, but then came back down to normal after a second or two. I assumed that was the thermostat sticking...