A lot of the electronics have
serial ports for maintainance.
I've bought them all out to
a panel in the passenger area.
These include, gps, radio,
transponder, FLIS and encoder.
I've also put the speaker for
the GPS there, and a place to
plug in to cigarette lighter.
There is also a little jack
for bringing in music into
the intercom system from a
ipod or the like.