pressure switch

i need a diagram or some instructions on how to hook up a pressure switch. i have 2 viair 380's and 2-5 gallon tanks.i want a 175 on and 200 psi off switch. thanks

main power to the compressor needs to go thru a relay/solenoid, the pressure switch goes between a keyed or switched power source and the relay/solenoid trigger.

www.gravity-werx.com - pick up a viair pressure switch/relay, there are 4 wires, all are labeled.

the viar p.switch is a nice easy way to hook one up, even has
a leed to hook up to ign. switch. so compressors wont kick on when truck is off during those cold months, or those tiny leaks you dont fill like messing with