reverse light wiring

[TwinsSpeedShop]

Started wiring in my LED tail lights and reverse lights. I tapped into the the light green wire at the fuse block and got nothing. Started checking and it gets power in drive instead of reverse. I came home and checked it against my wifes tahoe and the wire im using gets power in reverse as originally thought. My question for everyone is if you think that it can be the range selector.

thanks in advance