You need to select RDAC and engine senders for engine functions (EFIS and EMS)
You need to select SP-6 and SP-7 for heading and attitude functions (XTreme EFIS)
If you do not select SP-7 attitude sensor, you will still have a GPS-derived bank angle display that uses GPS flight path for bank and vertical climb/descent (no pitch information) (XTreme EFIS)
GPS antenna is included - but there is no GPS moving map. GPS is used for ground speed and range calculations as well as a backup for AHRS, and as a basic navigator (XTreme EFIS only)