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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Back after many years.
2003 F250 CC LB 4x4 7.3PSD
Minotaur user.
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