Hey guys, I have a 91 lx with what I was told was a rebuilt 5.0l. When the engine is cold, I have about 40 lbs of oil pressure and wont go any higher. When it's warm it wont go past 35 lbs when I go though the gears, and under 15 lbs at idle. The factory dash gauge was barely registering so I bought an autometer electric gauge to come up with those numbers. The engine runs great, dosen't make any noise and dosen't smoke at all. Do you think the engine is done or is it the pump?