I have a 1994 jeep grand Cherokee with a v8 motor it is awd, it has sat for about 2yrs I just got it back on the road about 2 weeks ago, I am now having oil pressure problems, if the motor is cold the oil pressure stays around 60, but as the motor warms up the pressure steadily drops but it doesn't go below 10, now when im idling while the motor is warmed up the pressure drops to 0, but as soon as I hit the gas it goes back up to 10, so my question is what do I need to do to fix this problem

 

You did change the oil and filter. You should verify the oil pressure with a mechanical gauge.

 

Potentially your OPS, Oil Pressure Sensor.