I have installed the KLN90 and appears to work properly.
The click-spot in the virtual cabin is coded to toggle 'GPS_PANEL' that will open the GPS unit.
In the panel.cfg you would change: ident=
18000 to ident=
GPS_PANELThe code below is for replacing the default GPS with the KLN90.
Note: the ';' character will deactivate each line. You can safely leave the original GPS line entries and then restore at a later time if you wish.
[Window05]
Background_color=0,0,0
size_mm=250,120
window_size_ratio=1.000
position=8
visible=0
ident=GPS_PANEL
gauge00=kln90b!Kln90B,0,0,250,120
;[Window05]
;size_mm=300,333
;window_pos=0.175,0.453
;background_color=0,0,0
;visible=0
;ident=GPS_PANEL
;gauge00=fs9gps!gps_500, 0,0,300,333