If it will help you I can try to get the document scanned and post it on a site, let me know.
Red = +12v (jumped to blue)
Blue = +12v from battery #1 (2 amp fuse)
Violet = +12v from battery #2 (2 amp fuse)
black = ground at small screw on bottom of shunt
Orange = Battery #1 twisted pair to top of shunt
Green = Battery #1 twisted pair to bottom of shunt
Yellow = Battery #2 twisted pair to top of shunt
Brown = Battery #2 twisted pair tp bottom of shunt
White = +12 volt for back lighting
The shunt breaks the ground from both batteries with the ground lead from each battery going to the top of each section of the shunt (the split part of the shunt) and the bottom of the shunt (combined section of the shunt) going to the negative bus.