I'm trying to add Master Warning, Master Caution, and Autofeather annunciator lights to my flightdeck. The lights will be LEDs and controlled by IFS Photon. I have looked for FSUIPC offsets in the FSUIPC SDK and within FSInterrograte with no luck. I have found the offsets for the switches, but what I need the the "light".How do annunciator lights work within the King Air 350 or say the PMDG Beech 1900 panels? Is there an offset for the annunciators that is outside FSUIPC or are the lights hard coded within the panel? The PMDG Beech 1900 panel has Master Warning, Master Caution, and Autofeather annunciator lights just like the KA350. I'm at a loss of how you would capture whether the lights are on or off. Thanks,Richard

Those are calculated by custom code contained in a gauge, and are based on inputs from many sources. They are not stock FS variables that may be read by FSUIPC.