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What do you mean you will not use the GM harness? If your car is stock the best thing for you is to buy an aftermarket harness adaptor. Then you plug and play right into your factory harness and it comes with a wire diagram right on the package.
I'just would want to know the colour codes of the wiring from the HU.
GM spec's does not comply with the colours. Do the Vette have a own colour code ?