I am not sure if I have a gauge, wiring, or sending unit problem. I am looking for any additional troubleshooting steps I can perform to narrow down the problem.
On my 97 XJ,
1. The oil pressure gauge will read as low as 10-11 psi at hot idle. This seemed too low, and I put a mechanical gauge on it and drove around for a while. The mechanical gauge was reading about 17 psi at hot idle. The sending unit I've got in there is a new NAPA Echlin. The original sending unit wouldn't read past 40-42 psi and would also read on the low side, so I bought the NAPA Echlin. The NAPA Echlin one seems to go up to 50 psi, but both seem to read on the low side at hot idle.
2. The coolant temperature gauge may read a little high at hot idle - halfway between the 210 mark and the next higher one. This seems like it could be the fan clutch, or even some airflow issues with the condenser. However, with an IR thermometer pointed at the thermostat housing, the thermometer doesn't seem to show the higher temperature.
Do these issues sound like a sensor, wiring, or gauge cluster problem? I am at a loss on how to test any more without swapping parts.
On my 97 XJ,
1. The oil pressure gauge will read as low as 10-11 psi at hot idle. This seemed too low, and I put a mechanical gauge on it and drove around for a while. The mechanical gauge was reading about 17 psi at hot idle. The sending unit I've got in there is a new NAPA Echlin. The original sending unit wouldn't read past 40-42 psi and would also read on the low side, so I bought the NAPA Echlin. The NAPA Echlin one seems to go up to 50 psi, but both seem to read on the low side at hot idle.
2. The coolant temperature gauge may read a little high at hot idle - halfway between the 210 mark and the next higher one. This seems like it could be the fan clutch, or even some airflow issues with the condenser. However, with an IR thermometer pointed at the thermostat housing, the thermometer doesn't seem to show the higher temperature.
Do these issues sound like a sensor, wiring, or gauge cluster problem? I am at a loss on how to test any more without swapping parts.