ARE WE TALKING ABOUT YOUR TRUCK? SOME ARE LOCATED JUST BEHIND THE GRILL AND ARE BEHINDE SOMETHING SOLID SO WIND DOES NOT AFFECT THEM SOME ARE MOUNTED DOWN LOW UNDER THE TRUCK SO THEY READ ROAD TEMP HA HA HA WORKS FOR A CAR NOT A TRUCK THEY ARE UP HIGHER. BUT HEAT RISES AND THE ROAD IS USUALY A BIT WARMER THEN AMBIENT. IF YOURS IS LOW RAISE IT UP AND IT WILL WORK BETTER HAVE FUN