The heart and soul of our homespun onboard air setup is the Tsunami MF-1050. These little beauties put out 2 cfm each at up to 120 psi, and one of can inflate a flat 33-inch tire in about two minutes. We’ve used this compressor in several vehicles, and they’ve proven themselves to be cost effective, durable, and reliable. For our homebrewed onboard air setup we also picked up a heavy-duty relay to run everything through. The relay is normally used as a starter solenoid in Ford pickups, so it will easily handle the 60 amps our pair of compressors can potentially draw.