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The sending units for GM oil gauges are always suspect. I've had problems with them in GM cars dating back to the early 1990's. One of my first cars was a 1990 Lumina that would peg the oil pressure gauge on startup and then it would bounce all over the place depending on how I accelerated. Replaced the sending unit and it was fine.
It's normal for oil pressure to be high on startup when the engine is cold. The oil moves slower when it's cold, so the pressure is way up. When the oil reaches temperature, it's easier to move through the engine, so the pressure should drop way down at idle, and then you'll see it surge slightly as you accelerate, as the pump runs faster in check with RPM.
Oil pressure is nice to know. If it's reading funny, rely on your senses and info you can readily tell about the car.
1. Is any oil leaking?
2. Is the oil level, color, and smell okay on the dipstick?
3. Are there any warning lights about oil?
4. Does the engine sound ok?
5. Does the oil temp gauge read within spec when the engine is at operating temperature?
If all those items are fine, I'd definitely suspect the oil press sending unit...
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