Truck is a 92 rodeo, 3.1L, manual tranny, 4x4. My problem is that after the truck is up to operating temp, at idle, the oil pressure gauge drops to 0 and my oil like comes on. I know that the truck as oil and at idle it doesnt make any indication that it is without oil pressure when it sits there, just purrs like it sould. I have replaced the oil pressure sending unit on the truck and its still doing it. So, what do yall out there think it might be? Im at a lose here.