The Show Off Your SharpTools Dashboards! thread has a bunch of examples of how people have setup their dashboards from across a variety of different platforms. 
You would need to be able to login on the device that the dashboard is displayed on. For example, you could link a Phone/SMS login to your SharpTools account which would enable you to login on a Google Cast touchscreen display as that type of display typically doesn’t bring up a keyboard, but you can tap the keyboard icon to the right of the phone login which brings up an onscreen numeric input.
That being said, I haven’t seen a lot of people posting about actually using casting as a primary way to display their dashboards, so I wouldn’t be surprised if it’s challenging (or not possible) to login on many cast devices, like a TV.