Oil Pressure Sensor Location, Diagnosis, and Replacement

[_ExpeditionMan]

All,

I have done some reading both online and in the FSM and I cannot find where the sender is for the oil pressure shown on my oil pressure gauge in the dash. I know these are reknown for being inaccurate but I don't enjoy seeing the needle sit slightly below the normal range when sitting at highway speeds for long periods of time. The engine runs fairly quietly and does not burn oil so the pressure should be fine. My goals here are as follows:

1) Remove and test the oil pressure sensor. Need testing procedure if possible.

2) Replace sensor with new unit which will hopefully correct the issue.

3) Replace with more accurate sensor in order to determine if I actually have low oil pressure.

If any of you have gone through something similar or have advice for testing and replacement that would be huge. I'd love to put to rest the idea that I'm slowly burning my engine up. Thanks!

 

[SaulG]

1.Disconnect connector from warning switch and ground terminal on wire harness side connector.
2.Turn ignition switch to On position, then check warning light illuminates. If not, test bulb.
3.Ensure there is continuity between terminal and ground with engine stopped.
4.Ensure there is no continuity between terminal and ground with engine running.
5.Turn ignition switch to ON position, then check receiver gauge needle indicates Low.
6.Ground terminal on wire harness side connector through a 3.4W test bulb.
7.Turn ignition switch to ON position, then check bulb illuminates and receiver gauge needle moves to high side.
8.On 4Runner and Truck models, measure resistance between terminals A and B. Resistance should be about 25.0 ohms. If not as specified, replace receiver gauge.
9.On Land Cruiser models, measure resistance between terminals. Resistance should be 22.0-28.0 ohms. If not as specified, replace receiver gauge

Sender should be next to filter.

 

[fourwd1]

Oil pressure sender is usually mounted right by the filter.
The oil pump could be wearing out on on your 24 yr old truck, which could account for low pressure.