How to refer to a shape which is grouped within another shape

The following code was suggested by Andy Pope and it works making the needle of a meter point to pos, and putting the value into a textbox which is also part of the meter.

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What Andy did not know was that I had made the first part of my code work by ungrouping ShapeName (the needle) from the Meter Group that it had been part of.
As essentially the same meter will be used 4 times in my project it would be much better to be able to leave the meter group intact and refer to the needle group in code. I have tried using the GroupItems property like

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But the code does not recognize the names. Am I on a hiding to nothing or can this be done?
John

Andy here is the meter divided into 2 groups

Andy many thanks for your help. There are parts which I don't understand like .TextFrame2.TextRange.Text, but I hope that I will find answers in the Object Browser.
John