This "Next Generation" Safety switch is designed to protect your engine from a "lean" condition caused by low fuel pressure. the best location for this safety switch is at the outlet side of the fuel pump. this location will allow instantaneous nitrous system shutdown in case of fuel pump fauilure. It is pre-set at 4.5 psi however it is adjustable in a range of 3.5-10 PSI.
Note: Do not install the FPSS between the fuel pressure regulator and the fuel solenoid. The normal momentary drop in fuel pressure when the nitrous system is activated will activate the switch resulting in erratic nitrous system performance.