Are you talking about this? If so, no need for the gauge. this one instead. It'll use 2-3 mini CO2 cartridges for 2.5g. I have it and it works fine. It's already carbed, you just need it to push the beer out.
Being Dealt (kegged): Carbed Crystal light lemonade for the boys, Delta Bravo IPA, Applewinder
Primary: Climbing stout
Primary #2: ESB
Big Blind: Pucker Bitter
Tasty Remembrances: White 'N Nerdy, Dynamite Red (Hop bursted), APA, The Bonaduce (irish Red), runners stout, ridgeback brown,
from my big ass computer sitting on my floor