If you are used to electrical relays and micro switches where you have C NO NC then it's easy. Connection between vents - C. Bottom connection - NO, top NC. The wiring shown is for a heavily grounded robot system. When I installed this on a truck I only used B+ and Neg. Your RED wire is B+, your BLUE wire is negative, and I left the GREEN wire disconnected. Thus, the LED lights up when switched on. I put a tube plug in the NO port and just used the NC port. When the spool is released, the port vents air pressure. What I did was use half a brake can to control the lever. Its internal spring returns the lever to the neutral position.
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