I am running full blown SV on my RV9, but am assisting a friend with the older Dynon EFIS/EMS displays, redoing his avionics with dual radio and an PS audio panel. He wants the audio output from the Dynon's into the Audio Panel. My question, each unit has a separate audio output, pin 18 on the EFIS and pin 31 from the EMS( I think). Do I wire both these separately? Only one? Will he get both flight and engine audio output?