Anyone experienced the temp gauge being all wobbly?

It "seems" to be mechanical in the gauge itself. When I start the car (power up the electrics before ignition) the gauge jumps up to where it belongs. But instead of just reaching its destination it sort of wobbles up and down around where its supposed to be (as if the needle was on a spring), before it stops.

It does NOT do that on your cars, right?

Also, when driving the needle sometimes jumps up a notch stays there for a while and then jumps back to the middle. I'm sure it's not the actual coolant temperature. System is well bled.

I'm thinking either it's a mechanical thing in the instrument cluster or perhaps an issue with grounding, a faulty connection or something.

Any input?