http://www.chiefdelphi.com/forums/sh...t=pneumati cs
The pressure switches are like any standard digital input. There's no + or -, no specific way to wire it or hook the tubing up for the pneumatics.
When it needs to be filled, the pressure switch will be closed, it will show up as a 1 in programming (current).
When it is filled, the pressure switch is open, which is a 0 in programming (no current).
The rubber stopper on top is removable. Underneath it is a screw that can be adjusted. Tightening (clockwise) will raise the tripping pressure. Loosening the screw (counter-clockwise) will lower the pressure.