Any one know how to adjust or calibrate the digital temp gauge above the odometer? Since owning my 2005 F150 XLT SC 4x4 that gauge has read 140*F (assuming it's engine temp) ? Now all the sudden it doesn't have a reading, don't know what might have caused it to reset or go blank.

The analog gauge above it, still shows the motor temp to be in the middle, and ok.

 

There is a sensor that is most likely in need of some attention, or cleaning.

Open the hood and look at the front side of the center rad support. It is a cone shaped thing.

That is the sensor for the exterior temp.

If you are careful and clean it it should be fine

There are a couple of thread here telling you how to do this

Good luck

 

Once, I hit 100,000 miles on my truck, little stuff like this has been going on. Weird rattles, etc. I just need some warm / summer days to start working on it and check into some of these issues. Other than that, the truck has been pretty rock solid in 5 years of ownership..

Thanks for your help !

 

It's not your engine temp, but rather the outside air temp. As mentioned, try removing the sensor, verifying the contacts are clean, then reinstall. A new temp sensor will set you back about $25.00 from your Ford dealer if yours is shot.