Nitrous system; Nitrous gague?

[drew2bm]

Do any nitrous systems come with NO2 gagues?
Where would I be able to buy a gague by itself?
Do the gagues show psi left in the bottle?

 

[1990EclipseGSX]

If you get a NX kit, you can get the GenX package that has a nitrous pressure gauge, plus all the other goodies you need to run at a track.
You can get just the gauge and adaptor for your bottle from a decent Checker if they carry NOS stuff, or you can just it up off EBAY. Yes, the gauges show the psi left in the bottle, or whatever psi you have your bottle heated to. There is a certain PSI range that you are supposed to spray within, can't remember it off hand though.