Auto Meter Sport-Comp 2-1/16 inch (52.4 millimeter) Mechanical Water Temperature Gauge (ranges 140-280 degree fahrenheit). It features bronze bourdon tube 270 degree sweep movements and durable nylon gearing that make these rugged and long lasting gauges a proven high performance favorite for over 25 years. These mechanical gauges require no electrical power for operation making them an ideal choice for vehicles with no or low powered electrical systems. Includes 6 feet tubing. Includes 1/2 inch NPT adapter/fitting.