Temp Gauge Working Intermittently - Suggestions?

Update; The plug end at the sensor was a little loose. However, I decided to change the sensor based on "Redfish" response being the problem was heat sensitive. Plus, all other dash gauges are working well leaving me to believe I have good connections in the dash.
Problem fixed; The plug end fit more snug on the new sensor and my operating temperature is now sitting nicely between the "low" temp line and the "hot" temp line. My temp gauge was always on the low side with the old sensor. Thanks for your help guys.