Thanks @Dmitriy for looking at topic Yes, it accepts negatives as min/max, but when set (for example) MIN: -10, MAX: +10 and the value received is +5, then the graph is created from -10 (the MIN), passing 'zero', and stops at +5. Not a real "zero centered" gauge display. A typical use scenario is off course an energy monitor, when during charging a current flows from circuit to battery, and the opposite during discharging. Sure, a gauge is not "a must have", there is always a display widget... One can create even a "digital gauge" using LCD widget, but IMHO a gauge should be as real as it can be.
1) a pressure change indicator (drop or rise)
2) a level deviation indicator (can be setup as degree angle)
3) a voltage meter (with mcp3304 for example)
As an example: A gauge cannot be setup the way the picture ilustrates :