Drove the jeep to my sons house about 20 miles away today, cold the pressure was 60 psi as it warmed up during the trip it steadyly dropped, at a red light 20 mins into the drive the pressure finally dropped enough to cause the check gages light to come on and ding, after an hour at a resturant we headed home psi was about 30 psi so i decided to take the interstate home, 5 minutes on the interstate at 65 mph the pressure held at about halfway between 10 and 20 psi, as some as i stopped on the exit ramp pressure droppped to zero i pulled over, checked everything , every thing was fine, no noises, engine running smooth, i drove the last 6 miles to home at around 55 mph the oil pressure never raised above zero, when i got home i put the mechanical gauge back on, it also states zero oil pressure, i could see the oil in the oil line to the gauge, it wasn't moving, i revved the engine alittle and i could see the oil move slightly, but still zero pressure, still no engine noise, i removed the filler cap and looked inside, i could not see much, but i did not see oil splashing around but that does not mean anything like i said i could not see much, and i did not hear any lifter noises, or rockers tapping, everything seems to be running smooth and quite, so i thought maybe the port for the sending unit maybe blocked, so i removed the oil line and blew 150 psi of compressed air through the port, i put the mechanical gauge back on and no change zero pressure.
Does anyone know if there is another port that i could try the pressure gauge on????