Teltek USA Inside Outside Auto Thermometer Gauge Dual Display for Any Semi, Pickup Truck or Car - Bezel: Black - LED Color: Blue Press button on gauge display to switch between Fahrenheit and Celsius Temp range Fahrenheit: -99F to 150F (1F accuracy) | Temp range Celsius: -76C to 65C (0.5C accuracy) Two (2) 10' plug sensor cables for taking temperature readings (cable is easily replaced if damaged) Mounts in the standard 2 1/16" hole which fits most dashes. If 2 1/16" hole not available, can install in a mounting bracket, display or pillar. Or try one our self-enclosed box temperature gauges. When temp drops to 34 F the gauge will flash "ICE" then return to normal temp monitoring. The "ICE" warning will not flash again until the temp rises to 37 F and drops back to 34 F again.