Quote Originally Posted by Shawn McGinnis View Post
Best option for your current wiring would be to move the ICARUS output to serial #4 and use NMEA/ICARUS. Then disconnect the CO Guardian and use its switched outputs into the 4500's general purpose inputs to show CO and O2 warnings. Then wire the ARINC to serial #2 and the ADS-B to serial #3.
Aha, I had forgot that the CO Guardian had a relay output for the CO alarm. Nothing for the SpO2 sensor, but the CO is the important one ... I think this'll work, and gets basically everything into the existing screen. Thanks Shawn!