Garmin GFC 500 autopilot installation in Comanche

[AVDB]

Hi,

According to information at Garmin.com
GFC™ 500 I Digital Autopilot for General Aviation Aircraft

GFC 500 Certification Programs Currently In-progress for

Piper Twin Comanche

• Models: PA-30, PA-30B, PA-30C, PA-39 (Including Turbocharged Models)

with note 1
"Note 1 Light twin aircraft will require a GI 275 Electronic Flight Instrument"

Does anybody know what the minimum qty of GI 275 have to be installed for on board?

 

[sgavette]

 

[os1r1s]

 

[sgavette]