Gents: got a question about adding a foot pedal to a miller thunderbolt stick welder...I've heard one can use a stick welder to tig...I have a hi frequency unit hooked up to the welder,,but i would also like to ad a foot pedal to regulate the amperage for tig..gun is ok and everything works except i need to known where to connect the electricals to the welder for the foot pedal anyone have this knowledge??