corny keg pressure guage madness!

Hello-
this might be a silly question but I am totally non technical and mechanically stupid. I have a crap load of corny kegs, in one of which I am putting cider, so I only have one, however my guage is from my old coke system which has four hoses and connectors coming off of it. I only need one, how do I block off the three Im not needing right now so I can carbonate my delicious cider? thank you all ye great and wise brewing gods.

If the lines don't have individual cut-offs then fit the pipe and a cornie disconnect to each one, the only disconnects that will allow gas through in that situation would be the ones connected to cornie kegs.

Thats what I figured Im hoping to find something that will work at my local hardware store.