Join Date: Nov 2002
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Re: CO2 tank & regulator for onboard \"air\"
Forget the gauge, just plug the hole. The CO2 gas pressure is fairly constant but varies with temperature (800 to about 1400 psi) and will remain that way until you run out of liquid CO2 in the tank. You are right about the weight to judge how much you have left.
If you haven't already, just get a 150psi regulator and female quick fitting for standard air lines, that's it. You don't need to know the pressure. Works awesome for tires and air tools and does double duty for the MIG.