Is there a resource or reference somewhere that has the gauges of the different wires used in the CTS (or any vehicle) ?

I'm mainly interested in the proper wire gauge for:

1) running Audio signal (Left Audio +, Right Audio +, and Audio Common)
2) running Power from the fuse box (RD/WH wires)
3) running Class 2 Data (PU wires)

Does anyone have this info, or know where to find this info?

[EDIT]

An interesting find:

Note on this schematic: http://ctsowners.com/docs/radio/radio.pdf

Each wire has 3 lines of information. For example, the Ground wire coming down on the left side shows:

851
BK/WH
3

The first line is the circuit number and the second line is the color of the wire insulator. That third line appears to be the metric wire size. I see on other wires in that schematic that the bottom numbers include 0.35 and 1, as well. Those all correspond to standard AWG Guage sizes (3 = 12gauge, 1 = 16gauge, and 0.35 = 22gauge).

Is this bottom number truly the metric wire size? If so, then I've had the correct information all along! Please let me know if that really is what the number is.

Thanks!