When first starting the truck the gauge will go all the way to the right and then back down to resting position, even after the trucks been running for hours, it stays still. I've changed the thermostat, and the coolant temperature sensor thats just next to the thermostat. We tried a different gauge cluster and still no luck. Is my next best bet the sending unit? And that's located on the driver side head, right. Thanks for any input guys!
