That's why I was asking, since there really isn't any supplied info. I know that 6-7 shorted tells the machine that a pedal is installed, but it might not have that straight forward control of the lines to the pot. The panel control does still have function when the pedal is installed, but it only sets the max, so the pedal pot might be simply put in series with the panel control for pedal operation. Since the pedal would be unplugged they might not disconnect all the pot lines and have simply bypassed around some of them. This could cause issues if left in circuit by your switch. It will take a little reverse engineering to figure out just what is going on. A relay might be needed or you might do it with solid state. It really sounds like a neat feature and reminds me of the kind of control I used to have with my old Miller where I could switch either the amperage or contactor between remote and panel, and there was one plug for each, so you could mix and match between foot and hand controls, or none. Being able to just hit the torch switch and have the pedal cut out sounds like the way to go.