I plugged this
BT device into a FM modulator that was already installed for the DVD player I never use.
Install for the modulator is pretty straightforward-
FM modulator install
You have to play with the volume on your phone to get it right, but it sounds perfect when you do. I made an automation to automatically start Spotify when the BT device connects so music starts playing about 2 seconds after starting the car without me having to do anything. The only thing you don't get is hands free talking, but if I NEED to talk while driving I just put an airpod in, but that might be once a year for me.