Help finding a Cambridge Vario manual/info

Hi,

I've got a Cambridge electric vario that I want to keep using in my
newly reworked panel. The problem is that it is as old as the panel and
I can't find basic connection/wiring information on it. The best I can
read the nameplate info (It was hand etched on the nameplate) is that
the model number is "CIS60SR" (not sure if those are "s" or "5"; serial
number 1092; 11-18 VDC; Rev. 12. The vario has + and - power studs, a 5
pin and a 6 pin female plugs, and is hard wired with 2 toggle switches

The panel mounted audio box w/speaker is separate from the vario, with
a volume and a tone knob and plugs into the back of the vario with a 5
pin male plug.

Any help or direction to someone who would know about this instrument
would really be appreciated.

Thanks,

Dan