At this point you may as well install the headlight switch. It’s 100% plug and play, so really can be done any time. I did a LED swap on mine so it illuminates blue.
The sensor and cover can be installed. The upper part of the cover that I received is longer and hits the headlining. I’ll modify the headlining with a notch at some point.
You need to have the sensor pressed tight on the glass. My homemade clips are pretty good, but I also put a foam pad between the sensor and the cover to add pressure.
Now you can fire up Forscan, and using the Extended license, enable the Rain Sensing Wipers and Automatic Headlights in the GEM programming section.