there is suppose to be a better owners manual here some place I received the Tig 200P AC/DC welder last week and getting ready to use it do you connect it to air or just argon? It came here on time and seems to be in good shape I am waiting for tungsten and welding rods. I also have to get argon does it have to be a big tank or will a small tank work. I had played with a big water cooled welder years ago