need help with pioneer avic x940bt install in 2013

i am a noob and for my first mod i am installing a pioneer avic x940bt navigation unit in my 2013 tacoma access cab sr5 4x4 v6. i have a few questions a long the way as this is my first time doing this. i believe i have ordered everything to make this as easy as possible. i have the pioneer avic x940bt harness and metra 87-up toyota harness completely soldered up except the "reverse gear signal input" and "car speed signal" wires. im not sure what to do with them. what size are the speakers in the front doors and rear doors?

I ordered this kit to override the parking brake

http://www.amazon.com/gp/product/B008I5S4AW/ref=oh_details_o00_s00_i00?ie=UTF8&psc=1

I already have axxess aswc-1 kit for the steering wheel control and also ordered the turbowire harness for easier installation. i am not sure on installation of either of these in conjunction with my head unit

AXXES Axxess ASWC-1 Steering Wheel Control Interface

http://www.amazon.com/Axxess-ASWC-1-Universal-Interface-Connector/dp/B00B4PJC9K/ref=dp_ob_title_ce

$10 Metra 70-8114 Steering Wheel Control Wire Harness with RCA for 2003-Up Select Toyota/Scion/Lexus Vehicles

http://www.amazon.com/gp/product/B0064J4LOM/ref=oh_details_o01_s00_i00?ie=UTF8&psc=1

 

i just installed a 3200bt and left the reverse gear one taped off. i didn't have a car speed one. the reverse gear one is just if you're going to hook up a back up camera so that it knows to show the video. there were a couple other wires that weren't applicable for what i was doing so i just taped those off too.
for the parking brake, i followed this guy's instructions:
http://www.youtube.com/watch?v=lDGZEZrUdRo

gl

 

i ended up just ordering the parking override kit off Amazon for $10. still have other questions about the installation of the axxess steering wheel controls.