With 0W40, oil pressure will run as low as 3psi at idle. 5W50 will yield idle psi of 8-9psi.

With a cold engine, you will see as much as 80-90 psi even at idle, even with 0W40.

At operating temperatures, the 2000-3000 rpm range will yield 35 to 55 psi depending on what weight oil you run.


*The above numbers come from what I saw with a ProSport Electric Oil Pressure Gauge.
I replaced the sending unit at one point (mounting it directly to the port on the engine caused it to fail, I suspect due to heat) - and saw the same readings with the replacement sending unit.