Temp Gauge Calibration

Usually in the early morning on the way to work I listen to our local news station. I work about a mile away from the actual broadcast studio where they also have weather equipment. On the radio every 15 minutes they announce the time and temperature at the station. I look at my temp gauge and it's about 2-5 degrees off. I have even deliberately driven by the station to check the trucks temp gauge with what they are saying. My Honda's temp gauge is usually right on or just a degree off.

Also my garage is attached to my house so the temp in the garage is about 15 degrees warmer on colder 30 degree days. It takes a good 10 minutes of driving before the temperature drops closer to the actual temperature outside. My Honda will sense a change of air temp in about 30 seconds.

Is my temp gauge whacked? Do others have the slow sensing time I have in my truck? Is there a known hack that re-calibrates the temperature gauge?