My old Amazon Fire tablet is a car display.
Using a third-party tool, you can use an Android tablet or phone to stand in for an Android Auto head unit.
If you feel like you're missing out on Android Auto by having a vehicle with no screen, here's your chance to fix that.
I forced Google's Android Auto interface to work on my phone without a car, and, in a jiffy, it became a complimentary office ...
I use Android Auto in my living room now - and it solves ones of my biggest productivity problems ...