I found someone with a similar issue.
I’d like to check if I got the magnetometer orientation right, but unfortunately I still don’t know how to display the raw values of both internal and external compass in MP.
What leads me to believe the orientation is not right is that a) I am using a clone and b) if I only use the external compass the artificial horizon can go crazy sometimes.
I also have an holybro unit with included GPS unit, but missing some connectors for it so i am using these clones in the meantime.