Hi Bjarti,
You should try to add in your panel [Vcockpit01] section the following gauge
gaugexx=dsd_p3d_xml_sound_x64!Debugger, 420,550,600,80
which should give you information about the files it is looking for.
To help you, we need the different path of
your aircraft
the dsd_p3d_xml_sound_x64 path
the sound path (local to aircraft or global to P3d)
I know by experience that the naming of the path are a little bit special...
Gérard