Help Wiring Backup Sensors to Left Taillight

I am in the process of adding parking sensors to the rear and need to know which wires to tap. Opening the access panel driver-side, I need to know which wires are the positives for reverse and brake.

If someone can help me identify them I'd greatly appreciate it.

 

Your TRD Pro came with Blind Spot Monitor and Rear Cross Traffic Alert. Are you trying to add even more sensors?

 

It didn't have any sensors to indicate you are going to hit something backing up (ie no beep beep). The only one to have that is the Limited model which has 4 sensors in the rear bumper and one on each front corner.

 

According to the 2010 wiring diagram, the reverse lamp wire is red and the stop light wire is blue.