Cannot help you as far as maker, but the switch you need is the voltage (heat range) control, while the upper right switch is your wire-feed speed, and the upper left switch is identified as as a spot timer (controls the length of pulse with each pull of the trigger). The gas on and shut-off solenoid should be controlled by the gun- trigger (The solenoid should be the small blue square at the back of the machine and entry of the gas tube).