that's higher than I have seen on either of the jeeps I've owned, but like rocket says, what's normal for one jeep might be different than what's normal for another, what you should concern yourself with is when it changes drastically from what you're used to.
that said, I believe that the oil pressure gauge on a jeep is a negative trigger, such that a bad/weak ground to the gauge cluster will cause it to real high ... do you have any strange readings on any of your other gauges?
what kind of jeep is this? YJs and XJs that have the oil pressure gauge in the center of the dash, and not as part of the speedo/tach cluster, notoriously have ground problems. TJs can too on the normal cluster, but less frequently