Re: 1990 2.9 - fuel, temp, oil pressure gauges not working
Steve, I have attached some photos of how to test the temperature sensor. First photo shows the location of the sensor on the engine near the top radiator hose. Second photo is a close-up view. Third photo is what to do:
1. Remove the wire from the sensor.
2. Jump the wire to some convenient chassis/engine ground.
3. Check the gauge with the key in the ON position. If the temperature gauge goes to full hot with the wire jumped to ground, then you know the gauge is good and that the sensor is bad.
The oil pressure sensor looks similar and can be tested the same way. It is located on the driver's side, low on the engine block, right in front of the engine mount. It is a bit difficult to see, but you can get to it from underneath the truck.
$7.99 for the temp sensor and $9.99 for the oil pressure sensor at Advance Auto Parts. It was really quite cheap and easy, it's nice to have those gauges working. I have not done the fuel sensor yet as it is expensive and a little more difficult.
Good luck.
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