I used a plastic material that I got from our sign shop at work, they make letters out of it. It’s a quarter inch thick and it’s very light weight almost like a foam board but denser. It cuts with a utility knife. I had enough original glass on my dash to support it and be able to get enough of the mounting bolts for the displays through bolted to support them. I used 3M heavy duty mounting tape to fasten it to the dash, no visible fasteners and that stuff will never let loose.
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