Hello, this is off topic but not sure exactly where to post but anyway got a SnapOn MM140SL mig/tig welder & just wondering if a foot pedal can be added or tied in somewhere where i can have control of the amps while tigging aluminum. I've heard & been told yes but none that knows how but was recommended to post on this sight as the one that said post here said it's very possible someone would know how or has done it. Since it has a rotary type switch as seen in the pics, is it just tie a potentiometer inline with the tig setting wire i'd use the most & have it mounted in a foot switch which i already have a regular foot pedal that"s just for on/off operation or is it more to it than that. Any drawing of wiring or any info would be helpful whether its possible or not. Thanks.