speedometer [speedometers](a device that measures, and indicates the current speed of a vehicle) noun [UK: spiː.ˈdɒ.mɪ.tə(r)] [US: spi.ˈdɑː.mə.tər]The speedometer is recording 100 mph now. = El velocímetro está registrando 100 mph ahora.
tattler [tattlers](device that records mileage, speed etc.) noun [UK: ˈtæt.lə(r)] [US: ˈtæt.lər]