Brake Light wiring questions

I am installing a Kahtec Smart Stop 3 Plus Delay on my 2011 Tacoma DC (Here are the crap directions that the Kahtec has on their website). It must be wired into the brake light wires, but I don't know how to wire in both rear brake lights, then run a wire up to the third brake light.

I need to know which wires belong to the 3 brake lights under the kick plate near the drivers side door sill (I followed the route from the rear drivers side tail light forward, to where it comes up through the floorboard and goes toward the fuse panel beneath that kick plate).

I would like to tap into the wires under that kick plate, since it's the only place I know where all 3 sets of brake light wires are in one collected spot.

I have this , and from what I can get out of it, the two wrapped sets of wires under the kick plate each have light blue wires. The set of wires that goes back down and through the floorboard and back to the tail lights will have two light blue wires, one for each brake light. The other set of wires should have one light blue wire, for the third brake light. The negative wires are white/black.

Now tell me, do I have my head up my ass, or am I on the right track here?
Any help would be appreciated.