i used to have an image from the jeep service manual of normal oil pressure during start up and warmed up, but i can't seem to find. it. i don't recall the numbers off the top of my head, but yours sound just fine. the oil will get thinner as it heats up, thus the psi drop. are you getting these readings off the stock gauge? if you want true numbers, you can run a mechanical gauge in conjunction with your stock gauge.
SOLD! 83 CJ-7. TBI Small Block Chevy 350/TH350/D300, Scout II Dana 44 front, CJ Dana 44 rear. 4" BDS Lift with 35's. Currently Jeepless.
Mine runs at 45-50 psi hot on the highway and 20 at idle. I have a mechanical gauge also.
86/00 CJ7 Laredo, 33x9.5 BFG AT's, 'glass nose to tail in '00, 'New' frame,wires and plumbing in '09. Carter BBD Carbed 4.0 HO in '10.
89 YJ Renegade. BBD Carbed 4.0 HO. Locked front and rear with 33x9.5 BFG AT's
Some Canadian Bush Jeep Runs and Build Photos: http://mikeromainjeeptrips.shutterfly.com (10 new albums added Sept 16/10)
Everything i've read from various automakers spec non-hydraulic lifter engines at 10 psi per 1000rpm fully warmed up with the recommended motor oil listed in the manual. My F-head idles fully warmed up at just a hair over 20 with 10w30.
I've never paid much attention to hydraulic lifter engine recommendations though. Your oil psi sounds in line with my other hydraulic lifter vehicles though from what I see on thier gauges (94 Silverado, 03 GMC van, 03 Honda Accord).