Confused by the oil pressure
Well, I've put about 500 miles on my freshened pontiac 350, and with that freshening, of course I put on a new oil pump. Well, in the last 100 miles, I've noticed that at a constant rpm above idle, oil pressure will jump around from about 30-40 psi. I thought maybe the pickup was getting uncovered, so I added another pint of oil, to no avail, and then another pint, and still nothing. So, I'm just confused. I don't know what's going on, the guage is as new as the pump-autometer brand, I pre-greased the oil pump before installing it, and primed the whole system before startup too. I hope you guys have some suggestions.