I adapted the very old FM/AM, cassette, and external CD changer in my very old Range Rover to have Bluetooth because it doesn't have an aux input and my phone d

I adapted the very old FM/AM, cassette, and external CD changer in my very old Range Rover to have Bluetooth because it doesn't have an aux input and my phone doesn't have a headphone jack anyway, and I want to listen to music or audiobooks off it when I'm driving. I looked into reversing the protocol between the CD jukebox and the stereo, and using an Arduino to inject the appropriate commands - maybe even get the "next" and "back" track buttons working too - but in the end I just fitted a cheapy bare-PCB bluetooth deelie into the cassette deck and wiring it to permanently think it has a tape in. It works pretty well, and it looks pretty standard. My phone sticks to the flat 1990s dashboard (remember when cars didn't have to have swoopy curves everywhere?) with a couple of bits of double-sided sticky Velcro, and plugs into a USB-C socket fitted where the lighter socket used to be. Good old farm truck technology.