Buick/Olds: 1998 Buick Park Ave. 128 psi oil reading, buick park ave, oil pressure switch

Question
I took my car in to have the oil changed.  Afterwards the oil pressure indicated 128 and it never changes.  I had people who
changed the oil to check for loose wires going to a sensor.  Everything ok they said.  They installed a new oil quick drain.  Could this cause a problem? Or is it most likely a sensor?


Answer
it can't be the "quick drain".
It is either the sensor, or the oil pressure switch (located at the rear of the engine( or the gauge is about to fail. Have a shop put a tap into the line at the sender unit, and check to actual pressure. One you assertaint that, you will know what to do. (replace your sender unit, or?