I've got the very same welder. Used it to replace the rear rollpan on my '46 Panel. Like it has been said lowest amp and play with the wire speed. I had mine to the slowest speed and it worked for me just fine on 20 ga metal. The trick I learned is just do spot welds, nothing over 1/4" or you'll get to much heat and warp the metal. When I place a piece in I spoted one end went to the other, went to the middle and so on just spliting the space between welds each time till it all filled in. Also keep a wet rag or a air line and blow gun handy to cool the metal down quickly if you over heat it. I hadn't welded in over 20 years and never used a mig before. I practiced for about a week on scrap metal, cutting it into strips and welding it back togeather before I went near my truck. And you will find that the older metal will burn thru faster than the new metal your putting in. Most importantly relax work slowly and if you think you are getting frustrated, walk away. You'll do just fine.
