[Matt 'Maverick' Watts]

high pressure air (hpa) is very dependant on the regulator on the tank. While an hpa tank can be filled to 3000psi or 4500 psi, the output of the regulator can vary between 150psi up to 1200 psi.
If you don't know what you're doing, find someone who does and have them do the work for you. The last thing you need is to be messing around with a system that could cause serious damage if not installed properly, or the wrong output pressure used.
Tapping for fittings, using the proper fittings, the proper lines, the correct output pressures are all critical when adapting a system to use hpa.