I got it working. I had to enter the settings into DisplayConfig one at a time. So I would enter one then restart and continue until I finished and it worked but I have a new problem now.
Font smoothing is not working! First of all, with the 800x480 resolution I can't see all the way to the bottom of the "Apperance" system preference window. That matters because that's where the Font Smoothing option is. I had to rotate my display 90 degrees in the "Display" preference to see all the way to the bottom. Anyway I can't get it to work. Any ideas?