Tank installation instruction:

Tank is already pre-charged at 7 psi, you just need to screw on the tank valve and connect a 1/4" tubing to it.
Remember to put some Teflon tape on thread (about 8 turns) on top of the tank, and then screw on the tank valve (hand tight only), then unscrew the compression nut off the tank valve, then push a 1/4" tubing through the compression nut, then tighten the compression nut to the tank valve (wrench tight).