2016 ram 1500 express rwg cab pioneer 1770nex, where to tap in for parking brake switch and for dimming

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I put a Pioneer 1770nex touch screen in my truck last year, my brother did the wiring, he didn't do the green wire for the parking brake, andbi believe it's an orange wire to be able to dim the unit. Any idea where i need to tap into, and do I use vampire clips?