One relay required per compressor with a pressure switch. Sold as a set of. Make sure that your compressor is 12V DC before ordering. No wiring harness is included with these 40 AMP Relays.
Viair 165/200 PSI Pressure Switch 2-40 AMP Relays & Fuse Holder 12V Compressors
JOE'S RACING SWITCH/ DASH PANEL, 4 ACCESSORY 46130, 40 AMP,RUBBER BACK & BOOTS
15526 Nitrous Express 40 Amp 4 Terminal Relay (Only)
DeatschWerks 4-00-VB40AX1 VB40AX1 Single Pump 40 Amp Voltage Booster
Electric Fuel Pump Relay Kit Fuel Pump Wiring Harness Kit Relay Bypass 40 AMP
Longacre 45420 Heavy Duty 40 Amp Toggle Switch #1733
