no oil pressure
2000 jeep cherokee 4.0. changed the oil pump, checked the mains they look good. start
engine cold pressure is up at 40lbs and with in 5 minutes it drops down to 5 lbs. any
Your oil pressure gauge coud be bad giving incorrect readings. Is it a real pressure gauge or and electronic dummy gauge?
i installed a mechanical gauge
Thats what I would have done too, now you will always have the correct oil pressure readings.