[tdyer]

Ok, here is an objective opinion of those last three posts: Mr. Smith did say "for the computer", but he also said "sending unit", which a parts store would "probably" take as the one for the guage. It appears that Mr. Smith and dr olds both meant the same thing which is referred to as the "Coolant Temperature Sensor". I've recently replaced both the CTS and the Sending unit on two different Chevys. If you're going to replace the CTS, it is normally located near the thermostat. The one that talks to the guage only is usually located near a cylinder on the block. You won't need to bother with that one. The CTS is usually about $8 - $12 and only takes a few minutes to replace. Just drain enough coolant to drop below the thermostat and unscrew it. Put some teflon tape or RTV on the threads of the new one, before putting it in. Good luck. Your problem probably isn't that simple though.