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The eight-pin main harness carries the system trigger wires (white with red and white with blue wires), a green wire to pick up the rpm signal, and another ground. Normally you would connect the white and striped trigger wires to a manual button or microswitch, however we wired them to the transbrake so the nitrous will start flowing the minute we let go of the transbrake. The yellow and orange wires are general-purpose output wires (GPO) and are used to trigger an ignition retard. Their function is programmable through the controller, and since they are low-current grounds, these are connected to relays, which trigger a 12-volt signal to the 7531 ignition retard we are using.