I think I just found the answers to my previous question. I just found that the output of the display tricked me as the last two digits of the tacho count were clipped. So I think it’s safe to say that the tacho-count shows the number of steps which is the same as degrees.
About the Ultrasonic-output, I think the explanation is as simple as there is a comma missing. It should be 36,1 and 111,1 cm 🙂