Next......remove seat. You also have to remove the left side cover for the fuse box. It looks like two allens, but it pulls off. Once off, there's an allen in the center and two torx on the frame. These have to be remove to pull the fuse/ecu panel out.
Next, remove ecu plug and feed it back through fuse block, with the diagnostic plug. You'll be plugging new ecu plug from unit into ecu, and ecu into this. Its a signal "interrupter". O2 sensors remain.
Once you pushed it through, mate with V&H unit and feed new plug and diagnostic plug back through and mate to ecu.
Remove the 4 screws from cover. There s a mode button an up and down button for rpm range. The company gives you a value to place in each mode number to 19, than you cycle throttle, and finish last values.