I have no I./ZG 76 photoes, but have one from 4./ZG 76.
2 Bf110 in flight, with codes m8+KM and m8+SM.
http://pics.livejournal.com/bersrk/pic/00001sgf
It confirmes that ZG 76 had M8 code, and ZG 1 - 2N, and John said.
This is photoe of several Bf110 from II./ZG 1.
http://pics.livejournal.com/bersrk/pic/0000257c
I found, that pilot standing in center (1st right from fueltank of Bf110 on background) is seem to be Hptm. Egon Albrecht
, Gr.Kdr. II./ZG 1.
His photoe:
http://www.luftwaffe.cz/images/albrecht.jpg
This clearly shows code of II./ZG 1 - 2N.