Yes that's programming. I fought with that for a while. I basically killed off everything that had to do with cameras and turned them on one by one till I got mine working
Gauge doesn't really matter just as long as it's about the same size as the other stuff.
Yes remove the rca wires completely as well as the wires for the other pins mentioned in my original post. Then use the the other removed wires to replace the rca wires allowing it to just pass though
Buying the newest apim you can find is usually the way to go. Ota updates do not work and there is no way to manually update at this time. As long as your apim is from a newer vehicle than you screen you should be good
Did you disconnect the battery. I basically hot swapped mine and had no issues with mine working.
From what I've gathered is sync 3 needs to be in and working . And just hot swap for the sync 4