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20 psi Oil Pressure Warning Switch - 1/8 NPT

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Brand: Longacre Racing Products

This warning switch is off whenever oil pressure is above 20 psi. If pressure drops below 20 psi, the switch will make contact to turn on your warning light (sold separately). Single-terminal design connects the circuit to chassis ground, so a 2-terminal warning light should be used.

The 1/8 NPT male fitting is easy to install in just about any application. For highest reliability, we recommend isolating pressure switches from engine heat and vibration by using our Combination 4AN Bulkhead Mount and 1/8 NPT Adapter, Part No. 3208-02-04S (sold separately) at the end of a 4AN hose.

This switch is rated for 100 psi operating pressure but can take momentary over-pressures of up to 500 psi. If your engine regularly exceeds 100 psi, the switch should be replaced each season for highest reliability.

Part No.
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Condition: New

In Stock
Related Product Groups
Oil Pressure Warning Switches

Good Part But . . .


I have used these oil pressure warning light switches for years on vintage racing MGs that I build (cars notorious for abrupt oil pressure failure). And years ago I found that these switches are very helpful but don't like to be mounted on the engine. Vibration kills them. Pegasus used to sell a remote mounting bracket that grounds the the one wire switch to the bodywork. No more. I found a mounting bracket elsewhere, unfortunately at a cost much more expensive than the switch!

Skinny Little Boy From Cleveland OH

Grand Rapids, MI


Works Great!


It took me awhile to find a 20 psi switch! It was worth the wait.


Madison, WI, United States


correct warning


I checked Switch how is correct. This parts is no problem. Drops 20 psi, soon works.




20 psi Oil Pressure Warning Switch - 1/8 NPT

4.7 3