If you want to replace your 57l factory brake controller with a tekonsha it appears to me its the same installation as on a 46l. Just takes a little extra time to do and wont hurt anything.

2002 Toyota Tundra Without Tow Package Brake Controller
Toyota tundra brake controller wiring diagram. The electric plug you referenced 3040 p is actually the in cab under dash connection for installation of a brake controller on your 2007 toyota tundra. Wiring diagram colors from 2011 tundra harness to pilot controller. This wiring harness is designed to attach to tekonsha brand brake controllers like the tekonsha prodigy p2 90885. Installation instructions for 2007 2013 toyota tundra without the use of a piggyback harness. Hard wire your brake controller with your factory controller harness. The tekonsha controller brake sense wire goes to the beige wire at the brake switch and the white tekonsha wire is grounded to any convenient body metal under the dash.
Factory tow package required. Tekonsha said the ground wire in the tundras wiring for the brake controller is too thin. Order toyota tundra trailer brake control harness online today. Free same day store pickup. Installing brake controller onn 2011 toyota tundra using factory provided brake control harness. Check out free battery charging and engine diagnostic testing while you are in store.
Also add another wire from the white brown connection and run that to the ground screw behind the kick panel.