Adjustable Pressure Switches From Buyers Products Can Be Custom Set To A Specific Psi. They Trigger A Signal When Oil Pressure Is Too Low Or High. The Unit Can Be Wired Normally Open Or Normally Closed. Two Models Are Available: - Ps2575 Is Adjustable Between 25-75 Psi And Fits In Any 1/8 In. Npt Port. - Ps2501K Is Adjustable Between 250-1,000 Psi And Fits A 1/4 In. Npt Port (Ideal For High Pressure Lines).