These remote sensor temperature gauges are so common that they are
available in some hardware stores and many department stores. Sorry I
can't point you directly to a Ranger source. I'd just use the cheap
generic kind found around the house.
I've always wondered why people would want one of these in a vehicle
anyway. Once you're outside, you can feel what the temperature is. You
are already dressed for the weather presumably. The radio gives the
temperature every five minutes. But as they say, everybody talks about
the weather. It's 19°F where I am right now (outside).

Thanks A.B., will check into those and the best place to mount the sensor.