Search is your friend. Basically you take the housing off, remove the lens, paint the background balck, reinstall the lens, put the lights back on and your done. You'll have to bake them in the oven to heat the glue so the lens will come off, and the same to get it back on. Not sure what's done on the tails, I know there's a spray on tint called VHT Nite Shades that works well.