Hi DeathProof.
I am using an unit designed for the RC car world. It runs off 7.4v power and 100% pure vegetable glycerin ( same as used in ECigs ).
Its all self contained and I've run two Silicone hoses that run through the exhaust nozzles.
The switch is wired through the gauntlet hose, to the momentary push to make non latching toggle switch in the gauntlet. I connect it via a locking DIN plug flush mounted next to the other greeblies in the base of the jetpack.
I've also got a push to make switch wired into one of the belt boxes.
The unit runs off two 2.5ml squirts into each port where the hoses attach. Since the below pics were taken I've secured two plastic nozzles into the unit to make attaching / detaching the hoses easier.