I would start with a new sensor for the engine temp, and if that worked I would install a new one for the trans. I have also installed (plug and play) a Scan Gauge D. It will give you more info then you could possibly want. Camping World has them and they are GREAT. I wouldn't want to drive a pusher without one. $152.00 no tax in Oregon. deSanford PS it could be the gauge has failed.
Sanford, Linda & R cats: Molly, Levi, Cody
2011 Monaco by Navistar RV
Good Sam Life Member Good Sam Hams Chapter