Instrument box temperature needle

Hello friends,

I have a problem with the temperature needle of a BMW318I, M43, E46, year 1998, the needle marks everything to the right (hot) when the engine starts in cold, there does not move, it returns to its normal state when closing the switch, therefore I do not know what the real temperature is when the engine is in operation, the radiator fan, the thermostat, the temperature trumm Disconnecting these plugs The pen does not return to the start state, the cables were checked to see if it is in short-circuit they told me that it is fine, they also reset the instrument frame, and the problem was not fixed. Please help me with this matter.
Thank you

Check if there is no cable that built a high voltage that is passing near the meters this generating magnetism and would be recovering the problem. Do you installed any new instrument or any horn lately?

Try to disconnect the DS sensor cable and check the engine ground cables that is, you go from the motor to the body and check the mass cables that stagnated in the engine.- Greetings