I see your confusion. the FU is a 6 position rotary switch not a programmer like the Evo or Gryphon that has to take a few minutes to write your tune to the ECM every time you want a different tune. that is the beauty of a chip vs a programmer, all 6 tunes are instant shift on the fly.....
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DJ Phoenix (my modded) Hi-1200/240Tow/75FS/80DD/100/140SS +Minotaur
ASE Master Auto Technician 
2001 Ford Excursion 7.3 4x4
Projects. 1970's Hustler and Max II Amphibious ATV's
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