Connecting SHIMANO Di2 to your bike computer remains possible after connecting your Classified thru axle.
Please note that only your SHIMANO rear derailleur will be shown via this connection. It will not display the gear of the Classified Powershift hub.
To view the gear of your Classified Powershift hub, you need to connect your Classified thru axle directly to your bike computer.
Garmin
1.1 Connecting SHIMANO Di2 to the Garmin head unit
Check Garmin's instructions to connect your SHIMANO di2 groupset to your bike computer. You will now be able to see the gears of the rear derailleur (cassette) and the battery level of the rear derailleur and the shifters.
1.2 Connecting the Classified thru axle to the Garmin head unit
To connect your Classified thru axle to your Garmin head unit, you can follow the steps, explained in this article: Connectivity with bike computers. You will now be able to see the gear the Classified Powershift hub is in and the battery level of the thru axle.
Please note that Garmin cannot display both rear derailleur and Classified Powershift at the same time.
Wahoo
2.1 Connecting SHIMANO Di2 to the Wahoo head unit
Check Wahoo's instructions to connect your SHIMANO di2 groupset to your bike computer. You will now be able to see the gears of the rear derailleur (cassette) and the battery level of the rear derailleur and the shifters.
2.2 Connecting the smart thru axle to the Wahoo head unit
To connect your Classified thru axle to your Garmin head unit, you can follow the steps, explained in this article: Connectivity with bike computers. You will now be able to see the gear the Classified Powershift hub is in and the battery level of the thru axle.
Please note that Wahoo, in theory, can display both rear derailleur and Classified Powershift at the same time. Because both Wahoo and Classified use SHIMANO channels CH3 and CH4 we do not recommend making the connection between your Wahoo head unit and your Classified thru axle. This will lead to unwanted commands on your Wahoo device.