This is cool as shit! You can do so much with an old android phone. But this never occured to me. Using it as a HUD in virtually any car you have.
Not to mention connecting it to a $5 OBDII scanner and monitoring your vehicles vitals. Or anything else your old phone can do. I plan to do this in my new 4x4 with my old android. Just to monitor engine and trans temp. And maybe some trail maps.
https://www.makeuseof.com/repurpose-old-android-phone-in-car/