I've been messing around with these analog voltmeters. I have a working prototype to display internal temperature, but this can honestly display anything. Weather data, stocks, pc specs, etc. It uses an ESP32 to grab the temperature then output it to the needle. The screen is coded to automatically update to the correct range but you can honestly change this and calibrate it to anything. Also because of it's dynamic capabilities, one could use it to display multiple different metrics and change it on the fly. I'm certain somewhere here can think of a more useful use-case than I can. I'd be excited to see what you build!