.
I had more or less the same problem, while off roading.
Water Temperature Gauge moving in a crazy way.
The reason ??
The thermostat cable was disconnected.
When you open the hood of your Panda, look on the left side, on the rear part of the engine.
There is a small circle, RED colour, that should be the problem.
That's the place to insert the cable.
Sorry if the explanation is not the best, I made my best :devil::devil: