Is it not a feature of the aircraft? To the left of the magnetos in one of your pictures there is a silver two position switch called something like 'manifold drain valve' or something, click that into its alternate position and you should get MP back indicating.
What you see is "Cold& Dark" is normal. The manifold pressure displays the ambient pressure. When you start the engine, it must go down. Once the engine is running it should go up again.
The easiest way to repair is most likely to reinstall the model.
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