Pressure Gauge is included!!! for some reason it won't let me take it off the item specifics. 

Nitrous Express automatic bottle heater, with over 60 square inches of heating area and 240 watts of power. This heater begins to heat when the pressure drops below 900 and turns off at approx 1050.

This kit is the older design, it is factory set on the pressure, the newer 1 is adjustable. It also has the older orange heater. The newer 1 are black.

I never used it, I ended up going with a supercharger set up. So I threw this into my man room.

I'm also going to be putting up a nx maximizer. It a gen1. Never used. It is all knobs and switches unlike the new 1s so you can quickly set it up and change it.

Also a nx gm dual stage 20224, essentially its there dual efi with 2 shark nozzles. The jets that it comes with was for LT4 or LT1. So most likely you would need to get other jets. The bottle is gone lent to a buddy so he would have a spare at the track and someone walked away with it.