Hello,

where’s everyone putting the Temp sensor on their 2018 trucks with tow mirrors so that it is the most accurate. I installed OEM mirrors from a 2017 without the pre wired spot. I ordered the sensor from Boost but it seems to be off 9 deg after driving it for a couple hours

 

I doubt anyone has moved this from the OE position in the mirror. Earlier Gen13s had the AAT behind the front grille in the centre. If, after a long trip, your temp is out by 9°, I would check the wiring and connector(s) for damage or a poor connection.