I'm thinking the pickup screen is a little high for some reason, or an air leak has developed. I'd strongly recommend dropping the oil pan for a cleanup and inspection of the inlet side of the oil pump- - - -pickup screen, tubing, etc. That oil pressure is good enough with an adequate oil level, which tells me the bottom end of the engine is in pretty good shape.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!