1999 jeep grand cherokee v8 oil pressure guage drops to 0 after 5 min, and the check guages light comes on, nothing else wrong runs just fine and battery is perfect tested with load tester.

Could be the auto shutdown relay is getting weak. Try swapping it with the horn relay.

How many miles are on the engine? Have you tried to replace the oil pressure switch? is the engine making any type of noise due to low pressure reading?

It means that your engine is loosing oil pressure, it is a concern to be worried about. Check your engine oil level, the engine might need oil.

What are your guages reading? The CPU thinks it see's a problem.
My oil pressure would drop and my light would come on.
Oil, Charge, all could cause a check guage light.

Get it checked with a mechanical gauge. Replace sensor.

Same part...make sure you get one for gauge, not idiot light though. If the engine has any knocking or ticking when pressure drops do not drive it and have a mechanical gauge installed to check actual pressure. Parts often have different names for same item...your driveshaft is actually called a propeller shaft!!!

Check all of your fuses under the hood, and under the dash inside jeep on the passenger side in front of the door, on side panel.

The sending unit would be the first thing to change, at least it would eliminate that.

how many miles are on the vehicle this usually happens when the oi; pump or engine is wore out.

if the engine is running normal and there are no odd sounds from engine. probably needs oil pressure switch or bad connection at switch. any ticking noises and i would have pressure checked with guage