I got a Montana and it has the trip computer overhead that shows the outside air temps and the compus. Then you can hit mode and go thru the fuel economy, tripometer, etc. The temp gauge is reding wrong. It shows 46` when its 76`. I can reset the trip computer and that but doesnt work on the temp. I can i get the temp guage read right??

You need to replace the outside air temp sensor mounted on the front of the radiator support.