68ci/45 HIGH crossfire

[Briggsy]

Hi. i just got my first marker and tank. when i used the scuba fill system. This:

But when i turn my scuba tank gas on the gauge does not work. Also the gauge on my tank does not work.
there was a sound of rushing air into the 68ci tank for about 2 seconds then it stops. is this normal? cos i have never done anything like this before. My tank still has 0psi on it. but when i screw it into my autococker it fires up and i can rip balls. though it only has 250psi on my 750psi dye gauge on my ASA. should it not be more like 800psi? Anyway any help here would be very helpful

 

[dr.strangelove]

You sure you had the relief vent closed? Have you replaced the guage on your tank with an aftermarket one? If there's pressure in there, your guage should definitely be telling you about it. Oh, by the way, you might have better luck getting the answers you're looking for if you use a more descriptive title (for example, Problems Filling from Scuba Tank, as opposed to 68ci/45 HIGH crossfire).