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Tim I think you will find the meters can not be made Pre Fade but if you PFL the group they will display on the PAFL meter or if the group overloads the red LED by the layer button that the group is in, will flash indicating an overload in that layer (as per channel peak).
However I am lead to believe there is quite a bit of headroom even if the LED flashes momentarily.
Hope this helps[8D]