I worried about the low oil pressure in my 216 for years. One day I checked it with another gauge and found out my gauge was off.
My Dad brought a couple extra gauges over that he had lying around. "Make sure the gauge isn't bad, all that new Chinese stuff is crap." he said. I tell him I already ordered a new pump and will just replace it, can't be the gauge it's brand new. "Won't take but 2 minutes" he says and heads over. Both of his gauges read 32 at idle, and increase into the 40s with RPM increase. Dad smirks, goes about disconnecting his gauge. My new Chinese oil pressure gauge is junk. Ordered the Melling pump this morning so at least I'll have it on hand if the existing pump goes sometime or if I have to get in there for something else.