is it pegged all the way out or is just reading zero? it will determin if its gauge wiring or sender. if it was wiring it would be pegged wide open. if it was the gauge. wen you cycled the key it wouldnt move. and if it was the sender it could really do both. what i do to check it is buy a new one. unplug the one off the car with it COLD! haha and plug the new one in with it sitting in a cup of hot water. turn the key on. if the gauge moves its the sender. if it doesnt the hunt begins. and if you do it that way you wont dump out your coolant and shit for a bad gauge.
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1998 Firebird:buncha parts thats used to make it go fast..... not so much anymore. 
BAAAAAA!!!!!!
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