Solutions
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Raphael Hardholt's post in FSX default Fuel and Payload CG% calculation was marked as the answerI finally found it.
It's like this:
The center of the circle is at around the 12th knotch up from the top.
Then the calculation goes like this:
12/32x100 = 37,5%
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this is the total amount of knotches in the screen.