Review on 🚘 AUTOOL OBD2 Digital Car HUD Speedometer with LCD Display | MPH/KMH, Overspeed Alarm, Auto Voltage Meter, Water Temperature Gauge | Suitable for 12V Petrol & Diesel Vehicles by Rui Knain

If this product had a decent instruction manual I would give it 5 stars. Installation was quick, about a minute. But then it was 30 deciphering a tiny, poorly written instruction manual that has a large number of possible functions. Only bought because of the speedometer. Getting there from, for example, instantaneous fuel consumption in liters to speed in miles per hour would be easy if the manual made sense. Now that I've overcome that, the speedometer is readable and accurate. That's why I bought it. The coolant temperature is a good lagniappe. Luckily I speak in Celsius.