The regulator has a gauge built into it that indicates line pressure. Adjust the gauge to 100 PSI from the air compressor with no airflow, then monitor the pressure once the air line is connected to the cylinder. If you don't have an air compressor, maybe you can borrow one? PM me for a phone number and we can discuss the process in a 2 way conversation.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!