Here's my avionics stack. Transponder is an old one, I have a new KT76A that I will install. Not shown is the DigiTrack IIVS AutoPilot Bynon D180 Glass Cockpit 209 GS Indicator Back up steam instruments (VS, Alt, El Turn Cord, Air Speed and RPM)
Here's my plan... Garmin 340 Audio with MB lights, 2 NAV/COM's amd Music input. NAV/COM 1- KX 155 flip/flop connected to 209 GS NAV/COM 2- KX 175B Connected to Dynon D180 driving the HSI Garmin 398 connected to DigiTrack Auto Pilot
It's like having three COM's, Two NAV's W/ VOR/LOC/GS