Hi Fellas, I researched pretty heavily a few installation of brake controllers before I tackled mine. Didn't want it at my knees as the left side is prone for bumping and the right is already occupied, and I didn't want it in the little pocket to the right of the steering wheel because I was worried about being able to use the manual override on the controller (and I was afraid of my keys hitting it) so I decided on the storage area just infront of the shifter. I hadn't seen anyone else post that they had mounted on here so I thought I would share.
I have the factory 7-way hookup so I had the brake harness already run into the cab. Like everyone else it took a bit of detective work to find the factory connector and it was indeed finally found via feel instead of sight...even tho I was laying in the floorboard with my head on the break pedal and there was a bit of skin left from my wrist when it was all said and done, but I think it was worth it.
I took this time being under my dash to relocate my LightForce light switch to the empty slots under the HVAC (I was pretty scared to mount it here because quite a bit of dremeling had to be done to fit but I like it much better than on the left of the steering wheel...my knee kept hitting it there) As you will notice my factory USB/AUX imput is missing...because I mounted my iPhone with the PanaVise and Proclip mount I made this a dedicated port and tucked it behind the dash to keep everything clean with no wires exposed and leaving me 3 more slots for Aux switches! :-)
For my brake controller install I purchased the Tekonsha P3 and ordered the 2013 Tacoma Pigtail with it. I connected the little pigtail to the factory connector and run it as far toward the passenger side as it would reach making sure not to allow it to rub up against any of those sharp edges under the dash and made sure my steering wheel column didn't come in contact with it when it was moved then I cut off the end that plugs into the P3. At this point I went to the storage area that I mounted the P3 in and drilled a hole just big enough for the 4 wires that come out of the P3 harness. (after verifying that nothing was directly behind this location by peaking thru the holes after my toggle switch blanks were removed) At this end I used the P3 harness that came with the controller...fished it thru the little hole and connected about where the little pocket is on the right hand side of the steering wheel.
Sorry I don't have any more photos...wasn't really planning on writing anything up but thought others might have the same idea as I did and I know how much confidence it gives you to know its been done before.