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best way to get Android auto on tablet

So I have some random thrud party head unit in my car that I am pretty sure is just running a customized version of Android 9 and I am wanting to get Android auto working on it preferably wireless but I think it did come with a USB cable if I need it. I've seen a couple things online such as headunit reloaded but they have mixed reviews just wondering if anyone has tried anything similar with any success