CO2 regulator leak

The pressure of liquid CO2 is governed by the laws of Physics. A single drop of liquid will show as much pressure as a full tank. At a given temperature, this is a constant. As the temperature rises, so does the pressure. Conversely, if you put it inside the cooler, the pressure will drop, then stabilize at a lower pressure. The pressure will not change until the tank is virtually empty -- aka, you're literally running on fumes. If the gauge reads low, and the tank's weight is higher than the tare weight ('TW' on the tank) then it's an absolute certainty that the gauge, itself, is faulty and needs to be replaced. About $5, BTW.

 

Faucets are easy...beer all over the floor/kegerator if they leak

 

This was just filled and shows it's low even if the tank is cold or warm, so i just go by weight.

 

Going by weight is the way to go. The high pressure gauge is not a fill indicator. It's not intended to be one.

 

If that tank contains any liquid CO2 at all, even a drop, then you have a bad gauge. You could replace it for $5-ish or ignore it and be no worse off than you are now. The only thing the high pressure gauge tells you in this application is 'empty' and 'not empty' - something that you can easily figure out on your own. That said, for $5, I'd be inclined to replace it (call it OCD).