I want use the sled but the wire cannot help me to do what I want.

I made a docking station, with the sled nut I'd like to remove some connectors that I dont use, (Tuner, car ISO) and connect my own wires to the harness that I could put to my docking station.

Can someone tell me how to do my own harness in fact ?
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Empeg IIa - 10 Gb - Red Fascia - Tuner, the day is coming - I Will Strike From the Grey -