So I bought one of these https://www.amazon.com/TUXING-4500p...00psi+carbon+fiber+air+tank,tools,1871&sr=1-2 How do you know how much pressure is in the tank? The gauge only works when filling something. There is a burst disk on the back and im woundering if I could replace that with a small gauge so I could monitor whats left in the tank? Thanks for the help