98 cherokee 4.0: low oil pressure and check gauges light
we have a 98 cherokee limited with a 4.0 straight 6, when leaving it idle for a while, the oil prssure guage will drop to almost 0 and the check gauges light will come on, it runs fine and no engine noises. also when driving the jeep, the oil pressure gauge will go well above 40 psi and then at a stop sign it will drop well below 40 almost to 10-15 psi. we did install a new pressure switch a few months back(down by the distributor) we checked it and it is still plugged in tight and not broken off like the old one did, can someone please point us in the right direction as to what we should be looking for? thanks for your time and help, todd in wi.