If you have the oxy-acetylene set already, you can do what I did... just remove the hose connector from the oxy reg, and replace with a 3/16 hose barb. Run fish tank hose from the reg to the wand.
IMHO, you don't need the flow meter. Just adjust pressure you get a low steady flow of bubbles.
It only takes 30 seconds of bubbles.
Keg #1: Brown Bomber Bourbon/Oak Vanilla Porter
Keg #2: The Bollocks ESB
Keg #3 Lawnmower APA
Bottled: Mjolnir Mead, Lazy Daze Hefe.