Tableau does not have a cogwheel chart type. The closest I have come to is the circle views or pie chart.
As much as I hate to say this, you might try using Excel/Word SmartArt (ack! )
They have the cogs as a Cycle option. You could also find some simple clipart online, import it as an image, and drop your text on top.
A third option is to import one or more cogs as a custom shape and thread them together on a dashboard as floating objects.