Does the display itself go out completely? Or read an inaccurate temp/direction? If it goes out totally, and the wiring is all good, I'd say it's in the actual display itself. If it reads inaccuratly, I'd say it's the sensor.
But make sure you check the wiring while it's not working. Make sure everything is still getting power even while it's acting up...then you'll know for sure it's not the wiring