Wait...... so is there any reason that if you had dual G5s you cant remove your vacuum system? Why would you need a backup if the other G5 is already a backup? I have a 430 and I’m installing dual G5s with the Gad 29B,flight stream 210,Gad13 and the GTP59. I have a POS standby ADI. I could just move my primary vacuum ADI over.