GoKawiilOpen Headunit app turns old Android tablets into Android Auto displays
A developer's Open Headunit app, priced under $4 on Google Play or free via GitHub, lets an aging Android tablet impersonate an Android Auto head unit, giving cars without built-in support a large touchscreen for navigation, calls and media. Testing found the setup imperfect but functional as a way to repurpose tablets that can no longer run modern apps well.