If your plasma cutter has a CNC port, then you can wire the torch firing function through the CNC port instead of wiring it internally. We recommend reaching out to your plasma cutter manufacturer to see if they can sell you a bare CNC plug. A bare CNC plug is a part that plugs into the CNC port on your plasma cutter at one end, and the other end has pins that are easy to wire into using pigtail cables. In most cases, the only source that you can purchase a CNC plug that matches a CNC port on a plasma cutter is directly from the plasma cutter manufacturer. The CNC plug should also include a pin-out that shows which numbered (or less commonly, colored) pins correspond to which functions. There is an example pin-out chart below that includes some popular plasma cutter models.