This is simple project, I am using TTGO T-display (ESP32 board), and rotary encoder to control PC Fan, of course I am also using Mosfet as switch. I decided to use TTGO T-Display because built in tft display.
Design for this great looking gauge was not mine. Please check this "upir" YouTube channel, on this channel you can learn how to program this gauge. UPIR channel https://www.youtube.com/c/upir_upir