For an even easier installation try the Electronic Throttle Position Switch. It's Calibrated to activate the nitrous at full throttle, so you don't have to fabricate a bracket to mount a traditional mechanical micro switch
Fits Vehicle Model:
Ford Focus ZX3, ZX4, ZX5, All
Fits Model Year:
2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, All