This works slick as heck...

I use a gas mixer and my tanks are in the other room and plumbed out to the mixer. I have a single gas line that connects to the machine and the mixer has a dial type flow regulator.

I never knew exactly what the flow was because the valve on the mixer is just a dial valve and I really don't think it's all that accurate. I have a gas valve on my torch and just set the mixer high and used it. It worked o.k. but then I came up with this setup.

http://i476.photobucket.com/albums/r...f/SNC00182.jpg

Here's another of the full cart -

http://i476.photobucket.com/albums/r...f/SNC00180.jpg

The flow meter is a Smith Precision flow meter and the lens rotates giving you Ar, He, CO2 or Ar in liters. I keep a pretty good supply of fittings around so I can usually make up just about anything I need on the fly. The flat bar is a piece of 1/4 x 1-1/2 Aluminum. It's just bolted onto the side of the cart. Go to your LWS and tell them what you're trying to do and they should be able to set you up with the fittings you'll need.

I run the gas from the mixer into the meter at 100cfh then set the flow meter to what I want. The output of the meter goes into the welder at the normal gas inlet. This way I still have the solenoid to shut it on and off and it operates just like it normally would. I used a standard inert gas restricter on the input side of the flow meter so I didn't blow it out.