Temperature indicator

Good morning I have a problem about Pioner Pioner Model 1986 about the independent indicator. The temperature vulvo is damaged and I do not have the part number and I do not even know which one indicates the temperature on the board because they sell me the one that is and the ahuja of the indicator rises to the max and which Czech with a fictional temperature device and marks me 70c ° actually my question is the remainder: does

anyone have the diagram on the temperature indicator?

Or they could give me a tip about how to diagnose the problem.