Hello,
The steering angle sensor must have at least one controller with bus connection. I don't believe that something like that can be housed in a plastic ring.
That has now changed.
I removed the steering wheel again, connected VAG-COM, and found the following:
In the center of the ring.
http://mitglied.lycos.de/chrhelm/0360gradab480.jpg
VAG-COM displayed a steering angle of 0.0°.
http://mitglied.lycos.de/chrhelm/0grad480.jpg
When turning the ring to the right.
http://mitglied.lycos.de/chrhelm/33gradab480.jpg
Then the steering angle was -33.0 degrees.
http://mitglied.lycos.de/chrhelm/33grad480.jpg
Have you completely lost it?
http://mitglied.lycos.de/chrhelm/0360gradab480.jpg
You are at a steering angle of -360.0 degrees.
http://mitglied.lycos.de/chrhelm/360grad480.jpg
I was able to determine the correct position of the ring

.
But BE CAREFUL when REPLICATING:
- Probably only works with cars equipped with ESP (Electronic Stability Program).
- An airbag fault is stored because the ignition was on without the airbag system being active. If an airbag control unit is not compatible with VAG-COM, the user will then have the problem that they cannot clear the fault, and they will be reminded of it with every trip.