Useful link here chaps https://forum.il2sturmovik.com/topic/41082-tips-flying-p-47/?tab=comments#comment-694959
The supercharger and turbosupercharger in the key mappings are completely separate mechanisms and are not linked on the P47....on this aircraft only the turbosupercharger mapping is relevant, the supercharger mapping is relevant to the I.16, Lagg3, Yaks, La5, Pe2 and A20. Did some checks just to make sure they aren't affected by each other before I changed my settings.
I've done the linking of the throttle, RPM and turbosupercharger (shows as 'supercharger' lever in cockpit). It works but I haven't tested it much in flight.
Cheerzen