Motor temperature indicator

The engine temperature indicator does not move lla changes the thermostat and temperature sensor those that go in the engine but nothing please (Chevrolet Corsa Swing 2003)

Hello.
I would lean that the one who fails is the temperature indicator of the table.
In the workshop with the computer you diagnose the picture at one time and make sure, but surely it has been unless where the needle connection is joined to the box. That is not the first time that happens.
Be lucky, and you tell me something .......