saleen779 you will need to access the instrument cluster connector located behind the speedo housing looking at the plug you will find A1 on the left side top row, B1 will be on the left side bottom row need to locate A4 and tap into that wire that is the VSS wire on the 2003 i would think it is the same one for the 2004 but not sure. if my memory serves me it was a green w/ a strip white i think wire
hope this helps
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03 Black Lux
03 Custom Chopper
96 Road King
82 Vette
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