well if you get the check engine light cleared, your the man,
mine always stays on and even after checking the code and reseting it, it still comes on, as for the temp sensor, well i have an fmax kit and they said to put it in the filter , i drilled through it and tapped it in there, but i guess you can leave it out somewhere in the engine bay,
my question is, why xs engineering? what made you pick this kit, and how many pounds of boost are you running.