Click on <+> to add a Numeric element under Numeric gauges.
Options
You choose the signal which values shall be displayed in the section Data. In the section Visual, you can select different display styles, specify digits and decimals as well as indicate when the signs are displayed. In the section Location you define position and size of the numeric display. These information will be indicated in percentage and can refer to an already configured gauge. You can select this gauge with Parent.
Appearance
In the dialog Appearance, properties for the display of digits, separators, frame and background are defined.

