He has already replaced the oil pressure sensor, and checked the oil pressure with a gauge, and no he is not using a Fram oil filter.
I have heard some people complain about engine noise that came when they changed oil brands, and left when they back to the original oil.
IIRC you went to a diesel oil (Shell Rotella?) with detergents versus a gas engine oil? But you did not mention what the API spec on the original oil and the current oil was, or is???? API SN, SM, SL or CH-4 plus.....? Also I don't think you answered my question as to whether you switched to synthetic, or stayed with old style dyno (non-synthetic) oil?
Most of today's oil is not what it was a year ago, or 2-3 years ago, as EPA has been mucking with the allowed ZDDP content in the oil, and has focused on the new style engine internals, versus our old style engine internals.
Keep in mind that a new oil pressure sensor could get clogged with junk, causing an error in the reading, so a recheck with a gauge may be of value.
Also what is the idle speed, the lowest idle speed????? IF it is under 750 rpm, that lowers the oil pressure when hot a whole bunch!!!
OEM JEEP spec is 13 psi minimum, hot idle in park at 750 rpm IIRC.
Get me these answers before I comment on going back to old oil!!!!!!