If its wired directly to the EFIS Main Connector then that would just be a flaps switch and you would turn Instrument ON/OFF to OFF in Flap Position as there is no positional feedback.
If you have an AF-5000-EM or EE and you are wired directly to the internal 37pin connector you would select Position Source: EMS
If you have an SV-EMS and you are wired to its C37_P* then you would have Position Source: EMS and Pin Select set to the proper pin which is normally C37_P9 (
See this for a picture)
If you have a Vertical Power VP-X module or Advanced Control Module ACM then you would select Position Source: ACM/VPX