I just barely installed this myself. I put a ball valve on the drain of my furthest back tanks, ran a high pressure line to an auxiliary 30 gallon tank (mounted under the floor, behing the rear axle). At that tank there is another ball valve and a quick connect. I just crack both open to fill it, then once my tank is full, I close both valves. When I need air, I crack the valve on the aux tank and its good to go. It keeps the systems isolated. Works awesome, and Ive used it several times now. You could just run off the factory system, but you'd be limited on volume, and would have to wait for your system to repressurize before you could drive.