I have a 97 dodge 2500 4x4 5 spd. It has an AFE cold air intake, #12 fuel plate, new luke pro gold clutch, boost/pyro gauge, 4 " exhaust- straight, 5" lift w/ 35's. I just ordered a set of new 90 HP injectors for it. How hard are these to install and will I need anything extra( aftermarket fuel pump, etc.)?