I had my Polar FIS+ Advanced fitted today, with help from my bf.
It was a bit of a pain trying to get the wiper arms off, they seemed pretty stuck on and we didn't have the proper wiper arm tool...
Removing the trim...
Fitting the Polar FIS to the gateway...
It didn't display in the car at first, so tried disconnecting the battery and locking/unlocking car (thanks to Eddie and VrStu) and it worked!
Just need to learn what all these numbers mean now.