OK Well I have put together a basic setup with coolingmist stuff put my own 25 gallon tank on runs off a boost switch. Now I was thinking could I make my own progressive setup by installing a second boost switch tied into a solenoid so I could make the pump kick on at say 5-10 pounds with a smaller nozzle and have the solenoid tied into the other boost switch and the bigger nozzle at say 15-20 pounds. Just an idea.

 

That would probably work great. Just be careful about injecting water at low boost. Probably won't take much before it starts to quench. I wouldn't even go there unless the truck was way over-fueled and having EGT problems.

 

I don't think I'm going to right now it was just and idea. Although I did accidentaly kick my pump on for a couple seconds while My truck was idling and it didn't do anything.