People with older displays are out of luck as of right now, considering that these newer head units were just revealed.
It's important to keep in mind, though, that the wireless support is now limited to the Google Pixel and Pixel XL, Pixel 2 and Pixel 2 XL, Nexus 5X, and Nexus 6P devices in North America. You can even leave your phone in your pocket or your bag.
Google has officially announced the availability of Android Auto Wireless, a feature which allows your phone to connect to your Android Auto head unit using WiFi.
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Remember, you'll still need a USB cable to establish the initial Android Auto connection. After the first wired pairing, wireless functionality will work automatically.
A vehicle or aftermarket receiver that is compatible with Android Auto Wireless. Version 3.1 of the app is also required. It's a pity that none of the Pixel or Nexus phones support wireless charging, as then you really good set your phone up on a mount and forget about it, but one step at a time. Google is apparently working with phone manufacturers on making the software work with their individual wrappers, but who knows when that will actually roll out to the public.
Expect to discover more about Google's plans for Android Auto at the company's I/O conference.