The TTO Digital Temperature Gauge allows you to easily monitor your engine's temperature -40°-300°C/575°F ensuring you that your engine is not over heating. Trail Tech's TTO Temperature Gauge offers features that include an easy to read LCD display, and an ultra-thin design. The LCD display lets you to easily view all gauge readings regardless of the angle or lighting conditions. Included with this digital temperature gauge is a 10mm Spark Plug Sensor.