I bought this welder a few years ago without the tig kit. It has been a really great machine. I recently decided to start tig welding with it, and I have everything I need except I have one question... The smith regulator that came with the unit, is this ok to use with Argon gas for tig welding? The reason I ask is that when i look in the manual for the machine, it shows a drawing of the tig gas connection to the machine being done with a regulator that has a flow meter on it. Mine does not have a flow meter it seems. Also I would like to know, if it IS ok to use the regulator that I already have, are there any advantages to using a regulator with a flow meter? My primary use for this will be tig welding low pressure heat system piping (not sanitary grade)