XML gauges

I'm trying to make a visor gauge for the Concorde that ties in the shift+enter command. FS just uses the flaps axis so that part is easy. I just need to know how to map the KEY_EYEPOINT_DOWN into the gauge.
Flight Simulator and other chat
https://forums.simviation.com/phpBB3/
https://forums.simviation.com/phpBB3/viewtopic.php?f=16&t=37110