[Al Skierkiewicz]

Originally Posted by eugenebrooks

We routinely use a common ground wire for switches, but we prefer to use several "pins" for the connection. That way, if the "one and only" ground pin connection goes bad, you don't lose all of your digital input functionality.

Ageed,
With sensors being so important to your software feedback and control, this is not a place to skimp. No single point failures keep you playing.