Yes that helped, and thank you much for your time and valuable input.
I ordered a set of gauges and a vacuum pump so hopefully I'll be able to play a bit this weekend
the gauges go to 800PSI on the high side gauge and 500PSI on the low side gauge and has a sight glass as well so I should be covered as far as gasses go.
P.S. I did take the cores out of the shrader valves before brazing, thanks to a you tube tutorial.