I drive a '93 YJ wrangler and the other day the instrument cluster containing speedometer went out and then later the other cluster containing the fuel gauge and oil pressure gauge went out. Both clusters going out simultaneously would indicate its a common problem, maybe in the electrical system? I've checked all the fuses under the dash and in the power distribution center under the hood and they all look good.
Not sure, but I think this is the problem caused by the ground screws coming loose for the instrument cluster.
Chris
When I bought mine, the speedo, temp, and oil pressure gauges weren't working. In my case, the three were unrelated.
The speedo problem was a corroded ground trace on the flexible circuit, right where it folds sharply behind the tach. I was able to carefully remove the circuit from the tach/speedo assembly, scrape off the corroded section, and fill in the gap with solder. It's working beautifully now, but I'll never know the true mileage.
The other two on mine ended up being bad senders, easily replaced for a few bucks.
Here's the troubleshooting steps for the oil and fuel senders from the factory service manual:
OIL PRESSURE SENDER (1) Turn ignition switch to ON. (2) Unplug oil pressure sender connector from oil pressure sender. (3) Touch connector to engine block (ground). Gauge should read at low end of scale. (4) When connector is NOT touching ground (open circuit) gauge should read at high end of scale. If OK replace sender. If not, proceed with step 5. (5) Check circuit between sender and gauge for an open. Repair as required. If wiring is OK, replace gauge.
FUEL GAUGE SENDER (1) Turn ignition switch to ON. (2) Separate fuel gauge sender connector from fuel gauge sender near tank. (3) Ground the center wire of the body harness side of the connector. The gauge should read at low end of scale. If OK, check sending unit (step 4). If not, check circuit between connector and gauge. Repair as required. If circuit is OK, replace gauge. (4) Turn ignition switch to OFF. (5) Measure resistance from fuel gauge sender connector center terminal to a clean chassis ground. Meter readings should correspond to those shown in Specifications. If not OK, replace sender. If OK, repair open from fuel gauge sender connector to ground.
"Measure resistance from fuel gauge sender connector
Does anyone know what these meter reading should be?? I don't have a manual and the specifications I have found on the internet all seem to be different.
That *would* help, wouldn't it? :)
'94 FSM says: Full is 88 ohms, half-full is 44 ohms, and empty is 1 ohm.
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