05 Impala Heat Guage not resetting

I have an 05 Impala. When I turn the car off, the heat gauge stays where it is. When I start it up again, it stays there until the car warms up and then goes up from where it was. I have found that by turning the key off and on quickly several times it goes down each time to bottom. What can cause the gauge to stick like that?

It's an internal problem with the gauge. I have never taken one apart, only replaced the cluster to correct the issue.