General guidelines
Gauge graphs show the part-to-whole relationship of one value compared to its total.
Example of a Gauge
The gauge starts at 12 o'clock and moves clockwise or counterclockwise depending on its content. When a value is expressing the amount used out of a total, the gauge will start empty and fill in clockwise. In contrast, if a value is showing the amount remaining out of a total, the gauge will start full then empty counterclockwise.
Examples of a Gauge clockwise motion
Examples of a Gauge counterclockwise motion