In case of anybody would be interested, see here my complete renew of my Gazelle: https://medium.com/@otapi/renew-a-faulty-e-bike-ffa566e3a855
Finally I replaced all the controller, PAS sensor and the display to 3rd party ones.
If I would know for sure only the sensor is wrong, I would simply order a replacement for that, like this one: https://hollandbikeshop.com/en-gb/branded-bicycle-parts/gazelle-bicycle-parts/gazelle-e-bike-sensors/gazelle-e-bike-sensor/gazelle-rotation-sensor-for-innergy-standard/
The motor cable has a fork: it's one tail goes to the accumulator and the other one goes to the display. Anyway, it is inside the motor HUB, as I found on one of Gazelle's user manual:
So, what I'm finding now, how could I test the rotation sensor and/or the motor HUB?
I have an old Gazelle Orange Plus Innergy (made in 2012). The e-bike started to be working properly only on very short distances, so I decided to renew the accumulator with a local tech. They installed new cells into the original accumulator case and the accu works with the original Gazelle...