How did you connect it?
Be warned - my Garmin produces figures in US MPG (it had me worried until I worked it out!)
Pretty straightforward - plug it in, done
As I most likely will keep this ecoRouter and Garmin 3790T when this car is sold, I didn't want to use sticky pads to fix it, so I used cable ties - neat and secure; will take some pics by weekend, if anyone's interested.
Just in case you were asking how ecoRouter connects to the actual Garmin sat nav - it's bluetooth
What head unit is it, looks neat