Pull the oil filler cap (carefully) while running and see how the "wet" the top end is (and maybe you). Won't tell you pressure, but gives you an idea. You can remove the oil pressure sending unit and screw in a cheap mechanical oil gauge from Pep Boys (they have the metric adapters for same also). Just to diagnose. A cheapie oil gauge with adapters ~ $20.

Something like this http://www.autobarn.net/eqoilpreselt.html

and this:

http://www.autobarn.net/eqoilpresgau.html

__________________
The Golden Rule

1984 300SD (bought new, sold it in 1988, bought it back 13 yrs. later)