Thanks to Bluetooth connectivity, many modern 12v battery monitors send this data wirelessly to a smartphone app.
https://www.themostpopular.com.....au/choosing-the-rig

OBD HUD Speedometer Solar-powered OBD HUD Speedometer – tracks your speed in real‑time, saves power with solar charging ⚡🚗 #cargadgets #drivesmart
https://www.ultimate9.co/au/el....ectrical/head-up-dis

First designed for military aircraft, this projection technology soon made its way into cars. The late 1980s Oldsmobile Cutlass had the first, though rudimentary, windscreen automobile HUD system.
https://www.purposeof.com.au/t....he-purpose-of-automo

Smartphone app 📱 for controlling vehicle driving modes 🚗, including Ultimate, Launch, Valet, and more 🔒🔓 for performance and security customization.
https://www.ultimate9.co/au/ev....cx-throttle-controll