https://www.dropbox.com/s/zdqps74fuk...763.jpg?v=1rc- has a picture of the unit with the clip attached. I pulled this straight down to remove from the metal under the dash (not near the firewall, really up under and slightly to the door side of the steering column) and the clip came out of the hole in the metal of the dash frame. Then I pulled the wiring harness from the original unit by pulling back the side retaining clips slightly. Once I took this out the white clip in the picture could be slid out using a small screwdriver to release the tab holding it to the unit.
Took the white clip and slid onto the TapTurn, attached the wire harness to TapTurn, then popped the other side of the white clip back into the little hole in the dash frame. All features work as advertised, very simple to configure the settings, I'm very pleased with the end result. Guess I'm also ready if I get the LED bug!