The Universal Plugboard is used in all of our MG series kits such as the M249 and is used across all of our systems including the Fusion Engine. It is also useful for custom wiring when a model specific switchboard is not available.There are four 2-pin headers and one 5-pin header on the plugboard. The 5-pin is for the main wiring harness. The 2-pin headers are labeled CON1 through CON4.CON1 = Nozzle Solenoid, CON2 = Poppet Solenoid, CON3 = Selector Input, CON4 = Trigger Input.