Linear Gauges are simple gauges of a single value or measurement simulating real gauges like thermometer or a loader. Mostly they look like bar (or column) or LED pointers. When there is an only gauge in the chart, there can be no other features and elements like legend or labels as they can be superfluous.
There is a dashboard with three LED pointers showing the acceptable and the critical values of possible revenue, expenses and the profit of a company with small bar pointers that show the actual status. This Chart has a title, it also uses the axes labels - each axis tick has a label. The LED pointers have different scales, but it is evident that one point stands for $1m for all LED pointers. The bar pointers have no axes and look like gray bars with an only label above that shows the pointer value. There is also a legend on a chart, but it is not interactive and helps to distinguish the meanings of the different-colored sections of the pointers. Tooltips show the main information about the pointers: the current value as the tooltip title and both acceptable and maximum scale values are put in the tooltip body.