15-40 at idle, 40-75 at higher RPM from the FSM.
The only bad oil pressure is zero kind of like blood pressure
The heater may be cycling cold air as the thermostat opens and closes depends on out side temps and what you are doing. The OE stat is a 195 degree.
Sent from underneath my Jeep
89YJ 2.5L TBI, AX-5, NP231 SYE, Ford 8.8, Yukon Grizzly, Tom Woods Shaft, 33" BFG T/As, 4" lift, Warn VR10000s.
AF Jeep Club Tail #184