That sucked.. My arm is all scratched up from givin' the ol' Cummins the 'reach-around'

At any rate, the old sender was bad; it stayed at 70psi, even with the engine not running..

So dually was kind enough to send me a spare he had (many, many thanks, dually, btw!)

Now, the OP gauge is working properly, and the Edge is now reading oil pressure..

idle, operating temp, is ~55psi, and 2100rpm is 77psi.

184k mi, and due for an oil change..

At any rate, thank you, dually !

That oil pressure seems VERY high!I sit at 20-22 warm idle, 58-62 normal cruise, rarely break 80 even with cold oil. The stock oil pressure relief valve opens at 70 ± 5 psi.

Hmm.. I'll double-check it this evening on the way home from work then..

So I took a few pics.First is at startup, [ATTACH]3280[/ATTACH] then cold @ 25mph. [ATTACH]3281[/ATTACH]Then idle for the others (note coolant temps) [ATTACH]3282[/ATTACH]Note that just before last pic, at 2000rpm/40mph, it was 65psi. Sitting in my driveway [ATTACH]3284[/ATTACH]Sent from my rooted EVO's tiny keyboard with my opposable thumbs...

Those look about right and lower than your first post, depending on where the OEM sender is the psi will vary. I can idle at 40+ until the oil warms up, which is after the coolant gets warm.

My 98 always has higher oil pressure than my 03 did.

  98whitelightnin said:

My 98 always has higher oil pressure than my 03 did.

The 03 didn't ever have a real gauge, just a moving idiot light.