I was looking to buy a fuel pressure safety switch. I know they just go in-line on the Schraeder valve.

How do they wire up?

How do you select the pressure they cut off power at?

I have a NX wet kit, spraying 100 shot, but maybe a 125 by end of season. Any help on which one is for me? Thanks!!

 

NX has a fpss and it will work by wiring it between the main system relay and ground.

 

The pressure is adjustable using a slotted screwdriver. It's easy to set and comes with instructions. I prefer using a fuel pressure gauge and ohmmeter...you set it a bit below your normal fuel pressure. You'll need to make sure your fuel doesn't dip when you hit the nitrous, causing the FPSS to oscillate, false or just plain fail to operate.