These photos show the setup of my argon tank. I added about 60 ft of hose to the tank, and have air valves both on the regulator as well is at the end of the hose (to reduce the need of purging and waste of gas when the hose is disconnected).
I used numerous 1/4" fittings and two valves, all 1/4" NPT from Home Depot. The gas line was a 60 ft air line from Wal-Mart.
The tank is held by a strap, holding it to a hook. My compressor is sitting next to it.