Gauge Panel Group Properties Dialog Box, General
Select General on the Gauge Panel Group dialog box to change name and group expressions for the data group specified in the gauge.
Type a name for the item. The name must be unique within the report. By default, a general name, such as Gauge_DataGroup1, is assigned.
Add a new group to the gauge data region.
Delete the selected group.
Select the field or expression on which to group the data. Click the Expression (fx) button to edit the expression. By default, this value is the same as the group field or expression that is added when you add a field to the category field drop-zone.
Type the next field or expression on which to group the data. Click the Expression (fx) button to edit the expression.