Hello Onnie. I have a small collection of GGS gunsights, although some of it has gone now. I have found an installation diagram for the GGS Mk 8, from AP1275E Vol. 1; Sect. 5; Chap. 6 which shows the various components and an installation circuit diagram, showing circuit details of it all. I also found the details of the gunsight itself from AP1275E; Vol. 1; Sect. 4: Chap. 3 (about 7 pages). I can scan them for you if you want them. I do not know if I can put the scans on the forum or not. Can someone tell me how to do it if possible? if not I can email or transfer them to you (and anyone else who might like them).
Regards
Mike D.