I recently got a cage and it comes with 3 LED strips. I got 2 red and one orange.

For the orange I will wire it into my whip lights switch, but for the red ones I would like to wire them to my brake lights.

I do not however wish to tap into the brake lights near the taillights themselves, I would like to instead run the wire from the fuse box. I have to run the wires forward through the cage to under the dash, not sure if I can tap into a wire under the dash?, or if I need to route back to the factory fuse box. In either case wheres is the best place make my connection?

Any advice?