For a dry kit, I would certainly reccomend getting a fuel pressure gage that you can read while driving.
The dry kits rely on greatly increased fuel pressure to add the additional fuel. The kit I had on my car for a while increased it from 40 up to 80psi with the nitrous activated. I would assume its about the same for a 4.6 car.
Have fun, but be careful with it. You don't wanna blow that plastic intake to pieces!
