Well I did the install on the Ultra.
The units themselves
Locate Front
Unplug
Now not only did I plug the unit inline, I shrink wrapped the grounding end for 2 reasons. One to cover up the pink plastic, and two, to keep water out of it.
I then also replaced the yellow zip tie and then zip tied the wires into the same place the harness was before.
Found the rear just behind the oil dipstick.
Unplug
Ran the grounding wire up to the battery ground under the seat
See the blue connector
Shrink wrap the grounding connection, same two reasons
Zip tie it all together
Tucked back into place
I must say, I 100% endorse this product. While the greatest benifit for a Twin Cam is to cool the motor down, which I won't be able to notice till next year sometime. However, the throttle response is nearly the same improvement on the Ultra, benifit as well.
Hands down this is a must do mod, especially for $100 and its complete ease.