hi, i have a 1992 corolla dx with 182000 miiles on it. i am having problems with my temp gauge( on the tach cluster if that makes a difference), the guage is reading that i am over heating when i first start the car after it has been running, and i kno its not over heating i can lean on the radiator, now after a few mins of running the gauge will drop down and act normal? i am so confussed i replaced the sensor and its a new gauge.....any ideas on what it could be? does it have two sensors or a relay i dont know about since its only doing it when i start it from a warm start? any help would be greatly apprecaited....thxs