Sometimes, a thing appears in your junk box out of nowhere. It’s utterly pointless, but you can’t bring yourself to throw it away (to the recycling center, of course!) because a though resides in your head - “Hey, I might need that some day for a project”. This is a story of such item. Around a decade ago, a faceplate for a Watermark TD-2100MP3 car head unit appeared in my junk box (pictured below). I can’t remember where I got it from, but I always thought it would be fun to figure out how one works and turn it into a nifty user interface for some project. As any good engineer, for every thousand projects I start, around 0.24 make it till completion. And I usually do user interfaces last, so you can see why it sat there for so long.