Originally Posted by mendozer
I never heard anything or saw gauge needles fall. After refilling it, Should I put silicone around all my gauge assembly connections, like where the pipes meet the bodies and so forth?
just realized i mistyped. 20# not 50
No, silicone isn't want you need. Check out all the o-rings on the kegs, those are usually the first thing to go. I agree with smashed4, spray it down with star san and look for bubbles. If the keg is sealed tight, check out your disconnects, barbs, etc. It's less likely that it's coming from the regulator (assuming you bought it already assembled), so I'd check everything else first.
You won't hear a slow leak, and you won't see the gauge fall unless you shut the tank off and watch the delivery gauge.