Do I need to purchase two units if I have two pads?
Nope! This one board connects to all of the wiring in the DDR cabinet itself and connects to all of the lights available. One board will light up the entire cabinet, pads, and marquee.
Will this work with pad only solutions?
No sadly, this board was designed for and communicates with the stock pad IO hardware shipped with the cabinet. It is not compatible with anything else. Check out the STAC Board if you have a pad that needs lights and input!