Originally Posted by newyorker
If you had your cluster taken apart for some reason, the needle might be broken. Could be the thermostat acting up, but then the car would probbably overheat, or it might be a short in the wiring.
The car would not over heat because the t-stat is mechanical (the gauge runs off an ECT sensor) and would still function. However, performance would definately take a nose dive
More than likely your thermostat is stuck open
BTW: Are you registered at www.clubgp.com