It will stay at 50-60 all the time if you put Lucas oil stabilizer in it. That's what mine does. Otherwise, 40 at idle, 50-60 when you're going down the road at speed... usually... as others have said the gauge accuracy is questionable. 80... you might want to check on that.
I bought an 87 MasterCraft Prostar 190 (ski boat) with a 351 Windsor in July '09 and my oil pressure would go to 80 and sometimes max out the gauge (almost 100). There was gas in the oil, so we (me and the old man) took the top of the motor apart and the main gasket was bad and there were a few loose bolts too. Amazingly it ran just fine but how long it would have continued to run in that state is a question I'm glad I never found an answer to.
That boat has VDO gauges though which are incredibly accurate unlike the gauges in YJs. So It could be the gauge but it might not be. Check to see if there's gas or god forbid... water... in your oil. That's how we found out with the boat.
92 Wrangler 4.0 5-speed -Canyon Blue Metallic/Black Interior '00 S2000 Silverstone Metallic/Red Interior '93 S-10 Blazer Tahoe LT Black/Grey Leather Interior
Last edited by Wheelman286; 04-12-2010 at 08:33 PM..