ZI suggest you have the engine thermostat replaced, it is likely sticking open and allowing the engine to cool down. The thermostat is under the cover that the upper radiator hose connects to on most GM engines.
SOURCE: Would like to talk with a car repair guru, not a computer guru
i think you have a combonation of problems here. most of it lead to needing a tune up .
just to get an understanding what is going on in your engine . i would bet to say that your enagine light is on . and probily an engine misfire code.
when the engine misfires somtimes it wil activate your knock sensor and ****** the timing thus raising your engine temp. if you havent flushed your coolant system yet you should. new plugs and wires and clean your throttle body.
good luck
SOURCE: oil pressure guage dropping
Sounds like the sensor is failing.Have oil pressure checked with a mechanical gage to confirm. A new sensor or wiring repair is allot cheaper then a new engine!!
SOURCE: tempature gauge quiet working emission test said
The temperature sensor in located at the thermostat housing under the throttle body. You'll see two wires going in to the sensor, make sure the wires are not damaged and still connected. It's rear for the sensor to fail but it's an easy fix to replace it, just disconnect the wire harness and unscrew the sensor with a deep socket and replace with the new sensor in the reveres process. Good luck and hope this helps.
SOURCE: Tempature gauge shows all the way hot but not over
Your cooling system is low on water the hot rating is coming from the air in the system super heating and then the coolant circulates through bringing the temp reading back down.
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