Thermometers -Water Temperature Gauge Sensor Sensor Highlights Generic Brand Water Temperature Gauge Sensor Sensor Description: Numbers clearly show water temperature, blue LED light for easy reading in darkness. High sensitivity and ease of use. Used to measure automobile water temperature Note: The gauge has a red light. It lights up when the water temperature exceeds 100 centigrade. Common connection of the temporary transmitter to the motor. In most cases, an "adjusting T-peice" (not supplied) can be used in place of the temporary sender so that both transmitter units can be attached. Specification: Supply Voltage: 10V-16V DC (12V vehicles only) Size: Approx 52mm*55mm*40mm Supply Voltage: 12V Style: Blue Digital Readout Measurement Range: 40~120 Celsius Degree Sensor Mounting Wire: 1/8" NPT How to install: RED: To 12V ignition switch (+) Black: Beat (-) Green: Temperature sensor Package includes: 1 Piece Water Temp Gauge 1 Piece TEMP Sensor 0.5-1 inch difference due to manual measurement. (1inch=2.54cm) Check the size measurement and picture carefully before making payment. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Please understand. THANKS.