I did my research and I'm 100% sure that it's not the problem is 99% of people on here say that it is. It's not main bearings, and it's not a sending unit.
98 XJ, 4.0, 4WD, RHD.
for years at startup (and yes, years) at start up I had 50 PSI on the guage, max. 30 PSI was absolute lowest...