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Update view model by another view model

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Hello all,
I don't know if I am right in the MVVM Foundation project with my question. If not let me know, please.

I want to develop a Windows 8.1 Store app. I have a list with several list items and a gauge view. As well the list as the gauge has its own view model. Change the selection in the list must cause a change in the gauge model.

I have no idea how to realize these dependencies between the models. I have googled for a long time but the satisfied solution I could not find. Can anyone help?

Best regards
gpunkt2016

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