I replaced my third oil sensor with one recommended on these forums from Amazon...reads 40 to 60 psi...no more check gauges!Like you, it seems, my ‘97 150K 4.0 motor ran and sounded fine, but I had the hot idle low oil pressure issue. 2 new oil pressure sensors didn’t fix it. 20W50 oil helped but not totally. Because thicker oil helped and after some reading and talking to experienced mechanics, I came to believe it was most likely crank or cam bearings. I considered trying a new oil pump and crank bearings but ended up swapping in a new stroker. With the same sensor and gauge, the new motor shows near 60 psi when driving and 40 psi at hot idle (the original was 30-40 and 0-15 respectively). Not the most cost effective solution, and it may have been that the old motor would’ve done well for a long while, but I wanted to do a motor swap and a little more power is nice. Still, I‘m interested to see if new crank bearings does it for you. Good luck!
Only issue is it's off consistently by +20 PSI...the manual test gauge I have shows 20 to 40.
Considering getting a street t, an aftermarket gauge and a pillar gauge pod. Also wouldn't mind monitoring fuel pressure.
Also to note...the "correct" working oil sensor also seems to have fixed my ghost emergency brake light issue and occasional misfire codes. I'm guessing the "wrong" sensors were putting garbage all over the control bus...but I want to get a couple tanks of gas through it before I claim causality.
-Mac