Installing a push to start and stop button, can I get a color code wiring diagram for the ignition switch?

Sure, here is the ignition switch wiring diagram so you can see how the system works and how to wire the aftermarket push to start and stop button. This guide will help you test the connections:

https://www.2carpros.com/articles/how-to-check-wiring

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Is it also possible for you to tell me the color code for the brake wire for the push start button?

I think you need the light green wire. Check out the images (below). Please let us know how it goes.