The race fueler will work much the same as the TFI/DFO or the V&H fuelpac will. It has the two extra crossover pots to adjust when you go from low to mid and mid to high speed fuel instead of the units with just one crossover pot from mid to high fuel.
Here's the write up for the fueler that you have.
PN 32136-06a
[FONT=Verdana, Arial][FONT=Verdana, Arial]SCREAMIN' EAGLE PRO EFI RACE FUELER
Tune the fuel flow on your EFI bike. The tuner can elec-tronically add fuel in much the same manner as increasing jet size on a carbureted system. It allows for quick tuning for the addition of less restrictive, free flowing intake and exhaust systems. The Fueler offers "bands" of adjustment that take into account operating ranges, such as idle, acceleration, and steady speed. The Fueler is a self-contained unit that requires no computer interface. Adjustments are made by setting fuel, RPM and accelerator pump potentiometers, with changes monitored on LED indicators. Race Fueler can be adjusted to add additional fuel for '96-'04 models, and add or subtract fuel on '05-later models. The compact unit is designed for "plug-in" installation and remains on the bike for convenient tuning. Tuner affects fuel delivery only and cannot change rev limit or spark timing. For race application only. Fits '06-'07 fuel-injected Dyna,Softail and Touring models. [/FONT][/FONT]
[FONT=Verdana, Arial][FONT=Verdana, Arial][/FONT][/FONT]