Thanks a lot everyone, this all really helps. I hope to find some time inbetween work to spend some extra time on this soon, eventually I need to get the rear camera wired up as well. If anything comes up that is important to note, I'll leave another comment!

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2002 BMW E53 4.6is - Estoril blue
1984 BMW E30 325 - Zinnoberrot
1964 Chevrolet Chevelle 300 - Meadow green