Review on 🚗 iKiKin M7 Dual Mode Car Head Up Display - OBD2 HUD GPS Speedometer for All Cars and Trucks by Tom Schuster

It's bright and readable even in bright sunlight. The included reflective screen is more annoying than helpful and unnecessary. Easy to install and easy to use to change settings. Accuracy is mediocre, although you can tweak it in the settings. The best I can get is fairly accurate at low speeds, but on the freeway I drive fast; 70 mph shows 74 on the HUD. When I set it to be correct at freeway speeds it says I drive 3-5 mph slower at lower speeds. I plugged it into the OBD port, so I don't understand how/why it shuts down so often.