DEWHEL 2" 52MM Electrical Black LED Digital Exhaust Gas Temperature Gauge Universal EGT 12V with Sensor Electrical Black Digital Gauge Series, 2"/52mm diameter Black bezel surround,270 degree start-up sweep LED digital colour display,Smoked dial face when ignition is off,Full Cristal Clear colour display when ignition is on Illuminated digital reading Range:100-1200 Display Voltage of Battery and Warning Function,A.Turn on the engine,Display battery voltage for 50 Sec.Volt Red LED will light Up,After Every 10 minutes display battery battery voltage automatically.B.If the voltage of battery is lower than 11.0V VOLT RED LED WILL Flash,The digital window would automatically display the voltage of battery duty,and flashing for warning.Free Lifetime Technical Support & One Year Limited Warranty