My Stages Dash M200 sees my eGR. It thinks its a Shimano Di2. My bike computer has a screen that let's me tell it how many gears, what the cassette sizes are, and what the front chainring sizes are (I forget what I did for the front chainring to show only as 1 but it works now) and from all that it gives me a ton of options. It can show a representation of my cassette and which gear I'm in. It can show just an information widget on which gear combo I'm in, and it can also show my ratio. The only part that's a little flakey is the battery, as it only shows full, normal, and critical battery levels, and seems to sometimes warns about critical battery when the battery is perfectly fine. I suspect it's maybe receiving info about a voltage level or something that doesn't quite match Di2 voltage levels so it thinks the battery is dying when it's nowhere even close.
