American Volt 2 Pack 210 Degree Thermostat Switch 3/8" Inch Engine Block Probe Street Hot Rod 2 Pack Automotive Electric Fan Thermostat Switch Kit. 3/8" Inch NPT Brass Temperature Sensor. Preset at 210'F Turn-on and 195'F Turn-off. At Temperature, Switch Closes Sending Power to the Fan. Measures All Fluid Temperatures, Including Oil and Coolant.