I have the same year and what I did was went up to the connection that is on the rearview mirror.
It was the blue and white wire that is next to each other. i pealed back the coating and soldered it to make it solid.
I ran a wire from the mirror above the headliner and down the A pillar.
After that it is just connecting it to the radio.
I spent a lot of time researching and didn't get any real good leads on where the best connection was.
This was what i got to work.
With doing this both monitors showed the image