Traveler

I'm going to build a supercharger setup for my car. The main hurdle, that I can see, is fuel management. I want to run a 5th injector setup and need to know which AIC to use. Either that or a piggy back to adjust the ignition and the fuel. I know that the Unichip will supposedly run a fifth injector and will adjust spark and the WOT fuel. What other systems are out there for just controlling an extra injector? I'm thinking about putting an extra sensor in just to monitor A/F ratio also. Any AIC's that do that in addition?