Originally Posted by Super rider
Did you ever get an answer to this? I have the same problem. Just installed mine with the converter cable and it's way off. It's over by like 15mph. I was wondering if there was a way to calibrate it as well.
The acewell site has the settings for this on their
Site under the sensor. I think it's 1380 and 1400
Depending on which model BMW you have
Here is the link