I rented a Caravan and it's image was ok -enough to see a child clearly -and I believe they use the identical system that VW uses right?
I don't believe there are focal adjustments on such a camera. They are a fixed focal length wide angle cheap NTSC camera. ALthough it could be software or firmware causing the problem at the dash.
I never gave a damn about the meterman,...
-til I was the one who had to read the meter....