Like Jeff said, you use a pilot valve that senses the pressure, then sends a pressure signal to the unloader on top of the cylinder head. Problem is, not all compressors are equipped with unloader valves. If you compressor is so equipped, no problem. If it's not, you might be able to adapt a 12v PTO clutch, but that would limit it to staying with the truck or getting a motor with an alternator.
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Today's Featured Article - Upgrading an Oliver Super 55 Electrical System - by Dennis Hawkins. My old Oliver Super 55 has been just sitting and rusting for several years now. I really hate to see a good tractor being treated that way, but not being able to start it without a 30 minute point filing ritual every time contributed to its demise. If it would just start when I turn the key, then I would use it more often. In addition to a bad case of old age, most of the tractor's original electrical system was simply too unreliable to keep. The main focus of this page is to show how I upgr
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