Right along the middle of the black part. Sorry, I don't have the pics, they're on another PC that I need to hook up. I recall there were some screws in the rear too that needed to be removed. Be very careful with the needles, as they're very fragile. Pry them up with something and don't let them spring off and fall to the ground. That's how I broke one. Buy the polarizer sheets online. You'll have to power the unit on to see which way you must orient it before you cut it out. Make sure you get all the glue off your LCD screen with solvent. I believe I used epoxy to glue mine back together. Still working to this day. My gauge was from 04 but works like new now.