A doughnut gauge shows one simple value, as a percent of the whole, using a simplified doughnut chart and one main color (the other neutral color is a pale gray). Doughnut Gauge charts have no tooltips and no legend. Interactivity is also automatically disabled (even when you try to turn it ON): you cannot slice, select slices or get a hover effect on mouse movements. Main challenge here was to display the unique data value (as quantity or percent, when Data Labels is ON) in the middle of the shape, in doughnut's hole. And we did this with a custom styled HTML text, for all featured applications.