Ok. I have mine on the table with a single retract hooked up to valve 1 and 2. One door Cyl hooked up to valve 3and 4. Hand pumping both gear and brake ports in. Know it's no vol but just messing with it. I have the brake air " out" plugged. Works great in the Man mode. Just gotta fig out how to get it working from the TX and RX. Ha. Having fun with it anyway. I think I'm gonna have to have some more Vol like a tank in- line to work with the gear switch.