So i was driving the loyale today and the oil pressur is just under 45 psi most of the time but out of nowhere it jumped to almost 85 psi while idle and driving.... what would cause this there is not to much oil in the car and its runng 10-30 weight. 

 

any input would be great.

Could be the oil pressure sensing switch starting to go bad.

 

Oldmics

Or loose.

is 85 psi the top of the scale?  (as in, did the gauge just pin itself to the high end of the gauge?)

Yeah it just goes right to the top when you start the car, there is no hesitation.

The wire to the sender is grounding-out somewhere.  My guess would be somewhere between where it leaves the engine loom (near the t-stat) and heads down the front of the engine to the sender.