I used a regulator between the compressor tank and the air solenoid manifold, but I had a York OBA setup in that truck. I have the same OBA system in my LX450, but I have factory lockers. Personally, I think ARBs are the way to go. I still don't understand why folks pay a premium for factory lockers. They're annoying.@jonheld - for lowering the air pressure: would you happen to have info or a part number for a 70psi pressure switch?