1. Download & install K++ mod for Volvo 7900 L & LH:
    https://pz.hkt172.tk/omsi/kruegermatrix/hc_volvo7900h/
  2. Install this to replace the original buses so that it works with BCS
    https://cloud.sepaurg.eu/index.php/s/ot9Q7afoF9ZwjPQ