Old android phone as HUD (heads up display)

[Moab]

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/