On my 1995 2.5L YJ I've noticed the past few days that the oil pressure jumps from just over 40 to 80 when I'm cruising and then press the clutch or take it out of gear (sudden RPM decrease).
Sort of like in this video I made yesterday while driving to work:
It has also been running higher than usual at 60 or just over. When I come to a stop it sits just under 40 at idle. Here's where it's running at about 2500 RPM while cruising down the road:
Is this normal? I don't remember it running this high before, but I've only had it 3 weeks so I can't say really how it has been running all along.