Hi Cas. Im looking into an auto drain. I have a dental lab, and Im using a Quincy 60gal 5hp 2 stage. I have been told by a reputable person in my industry that he has just connected a bendix DV-2 spit valve from an air-brake system off a truck. No wires, no extra signal lines. It just burps when the tank pressure changes. Its hooked up right as a petcock would be. Thoughts?