I have a question on my son's old 84 K5. 350 that has a low reading on the oil psi Guage. Used to jump up to 60 or so at speed now it idles way low and at speed barely hits 30. He changed the sender and cleaned up all the connections. Engine sounds fine and still runs strong, just a miner leaks at the valve covers. Any ideas?

Okay after some reading I'm gonna put a real guage on it. Go from there. Tried to use the search feature on this question...didn't want to work on this tablet.