WW
The 356N has an American STC for the installation of the Sperry 7000 auto pilot. This is a common type of AP for the period, fitted to types like S76, BK117 and others, and the functions are as per other 7000 installations.
The STC number for the 365N is SH2215NM and the RFM supplement is 27-5130-11. Hopes that's of some help.
Geoff