If your vehicle is not equipped with an outside temperature sensor then this is a must have for your TrailDash 2 or Dashpaq If your vehicle is not equipped with an outside temperature sensor then this is a must have! The EAS Ambient Temperature Sensor is a -40F to 230F Waterproof 0.2 diameter sensor ready to plug into the Universal Sensor Input system. Now youll never wonder what outside air temperature is again!