03 silverado vss wire, reverse wire

Attempting to hookup an aftermarket nav unit with reverse camera. I found that the reverse wire at the b/u lights is a teal green color and that the two wires from the VSS are purple with white stripe and green with black stripe, but I can't find anywhere where these wires are connected inside the truck. I thought that they would both be hooked up to the instrument cluster but when I tested every wire there was no response for the speed display or reverse camera. I am putting in a JVC KD-NX5000. I appreciate the help.