With the holes drilled, Hein attached one end of the wiring to a huge zip tie to pull the wires through the tailgate. Using a snake will cut down on the frustration of routing wires through an area where you can't get your hands. | 
The gate was reinstalled back on the truck so the wires could be run to the mirror. Hein chose to pass the wires behind the trunion and down behind the roll pan. | 
To get it toward the interior, Hein crawled under the truck and routed the wires along the factory harness. This is the safest place to run any type of wires because the factory keeps their wires out of harm's way. |
To get the wires into the passenger compartment, some interior pieces were removed to free up the carpet to expose this rubber grommet on the driver floor area. The wires were pushed through the grommet and routed up the pillar to the mirror area. | 
The mirror is made to hang on the factory mount that is glued to the windshield. Once Hein had the factory piece off, he replaced it with the Rostra unit. The factory mirror had a compass and a temperature display that will not function on the Rostra mirror. We are giving that up for a much better feature, a scre | 
The wires were hooked up, zip-tied and tucked out of the way under the headliner. The plugs on the Rostra harness are clearly marked and feature different ends to prevent you from hooking it up wrong. |
The power, ground, and reverse wires are routed along the front edge of the headliner and down the pillar to end up under the steering column. | 
The ground wire was placed on the steel reinforcement under the dash, after a ring terminal was crimped to the wire. | 
The reverse wire was spliced into the factory reverse wire, which happens to be a green wire for the Chevrolet Silverado. |
The power wire was spliced into a factory accessory wire, which is a brown wire. | 
With all the wires run through and the mirror in place, the dash and trim were buttoned back up. | 
The camera fits into this little housing that allows you to rotate the camera 360 degrees, which opens up the mounting possibilities. |
With the camera clocked properly, the backing of the two-sided tape was removed, and the unit was installed into the tailgate cap. For the last step of the grunt work, Hein installed the cap back onto the gate and made sure all the wires were properly tied up. | 
Here is our camera; we set it up to look straight down onto the trailer hitch. | 
Now, when we back up the truck to the trailer, we get a nice view of the hitch and the tongue. |
The Final Word
Thankfully, with the RearSight system in place, hooking up a trailer is a one-man job. We were getting really tired of trying to decipher what our friend was telling us as he flailed his arms to the left and the right. The camera system was easier to install than it would have been to teach our friends how to properly guide someone backward. Because the mirror has two more inputs, we have the option of adding another camera and displaying a GPS map.