Specifications: Voltage: 12Vdc Temperature: Approximately 185F On - 175F Off Thread Size: The Temperature Sensor Has A 3/8 Pipe Thread, And A 1/2 Adapter Included How To Use: Connect The Color-Coded Wires Per The Diagram (Product Image 2) Installation:For Dual Fan Wiring, You Would Need Two Of This Relay Kit. Easy To Follow Wiring Diagram Simplify Wiring Your Electric Fans. Red To 12Vdc Positive Battery Terminal, Blue To Fan Positive, Yellow To Ignition, Grey To Sending Unit Per Wiring Diagram. Direct Replacement Part Fits 10, 12, 14, And 16 Inch Cooling Fans The Thermostat Supplied With This Kit Is Oe Style To Mount In The Cylinder Head Of The Engine Or Any Water Jacket If Needed.