Testing my speedo

Currently I am restoring the front fork and rebuilding the front shock of our SS180. Once done the speedo will be "plugged" in to the front tire/hub. I need to know if my speedo works or if I would need to send it to Speedo King or buy another one. Therefore, with my drill and some odd shape bits I simulated a spinning gear drive plugged into my speedo and wammo it works!