Hello All, I have a 99 TJ sport with about 99k miles on it. The engine oil pressure two days ago pegged itself at 80psi on the gauge and has stayed there. It normally sits between 40-60psi when driving and below that when idling. The oil has been changed every 4-5000 miles, there is no knocking and the engine sounds fine. I did an oil change this morning and the oil was practically pristine so I'm some what confused. Also when I turn my key in the ignition before cranking the engine the oil pressure gauge goes to
50 without the engine running. I also went on a drive yesterday (100miles) and after about an hour of driving the oil pressure at idle would go down to about 60-70. I have heard these little oil gauges are notorious for crapping out so I'm wondering where to start. I have checked for oil leaks since high pressure blows a gasket and there are none. I don't own a pressure testing kit and the only ones I have found are $100-150 so that's out. I don't have the money to throw parts at it at the moment and it is my daily driver so how can I diagnose this issue? Where would I start? Should I actually take it to a shop for a check?Thank you for any advice/help ahead of time,
-Stephen