if you have an automatic the switch is on the bottom of the steering column.
https://www.americanautowire.com/wp-...3.34.26-PM.png
2 connectors on left are reverse and the 2 on the right are for the neutral safety.
yes that is the brake warning wire.
Where are you in austin? im just finishing the install on my AAW kit on my truck. could give you a hand.