Omni 100cu ft tank internal pressure gauge.

"k_h_d"After watching a video online it looks like you can simply plug up the exit fill hose and open the main valve to get a pressure reading of the internal pressure. Sounds easy enough.
Not sure what an Omni 100 is but if you have a fill assembly with a pressure gauge you just need a "dead head" on the end, open the valve (with the bleed closed) and it will show the tank pressure.