The inertia switch is device that kills the car’s power and engine in the event of a crash. The oil pressure switch is a device that kills the fuel supply in the event the engine loses oil pressure. 

In my mind, these are not related to each other. One is to avoid fuel leakage and fire.  One is to protect the engine from damage if you have an oil related failure.

Of course, there could be some overlap in a triggering event, but seems like the inertia switch protects everything.

The only bad part is trying to remember you have one after you hit a huge pothole and the car shuts down.

I have the inertia switch installed as per Nos681 installation.  And I’ve also not had the pump shutoff due to NY potholes, and bad roads.

OK sounds like we will do both and then test out the oregon pot hole roads too.

I know Ford Rangers had the inertia switch mounted in the kick panel area up high near glove box.
Fairly easy to get to.

Foxbody Mustang (1992) was rear center under all trim pieces in hatchback.

New Edge (2000/2001) convertibles were near driver rear tail light under trim.u

Last edited by Nos681 (7/19/2024 2:40 PM)

Mount the switch away from where it can get accidentally tripped.  I've seen it happen a couple time son Ford Rangers which had them on the firewall high in the passenger's footwell area (though apparently not high enough). 

For the oil pressure switch the only thing that would concern me would be what would happen if the switch failed while driving, causing the car to shut down.  Factory systems I believe would only "look" at that switch on start up.to avoid such a situation.