same thing happen to me.... but mine were reading high
I turned the car off twice while I was going down the road, and started it back up using the momentum of the car.... but the gauge was still wrong.... I arrived at my destination, and an hour later when I started the car up again.... all was fine
it sure does catch you off guard when your on the gas hard in first, and you see the tach hit 7100 rpm (was probably more like 5000)
I'm just crossing my fingers that it doesn't happen again.
Former: 95-530iM
Current: 99 GMC Seirra 1500