For some time now my oil pressure gauge has been acting strange. This is the symptom. Start the car gauge reads NORMAL, increase throttle gauge drops down as throttle is increased untill check gauge light is on, especially when cruising on highway @3,000 rpms. Let off throttle and check gauge light goes off gauge begins to read higher and higher pressure untill back to normal. At first I was concerned that my brand new engine had a bad oil pump , but I think I would have known by the way the gauge was reading so my guess is that the gauge is bad. Today I had to know for sure so I brought my car to the shop and me and my father hooked up a mechanical oil pressure gauge where the sender would go. Started up the car and at idle it read 60PSI "with engine hot" Reved up to about 3500-4000 Rpms and pressure goes up to 90 PSI. So my guess was right I have a bad oil gauge, so I hope this thread will help someone else in the future.