I finally got to ride my bike this weekend:) and the Acewell worked damn near perfectly - i must have done the wiring correctly;)
my speedo sensor is the one that plugs into the stock bmw speedo hole and required no adjustments - it reads perfect. not sure what problems tete was/is having - total plug and play.
my tack seems to work at lower speeds, but i noticed that it bounces a bit at highway speeds. i wired the yellow acewell directly into the stock harness (black wire i think).
I didn't find anything in the setup to let me turn off the fuel flashing. oh well.
thanks for everyone's contributions to this thread! extremely helpful!