To clairify....the original factory driver board had resistors. Starting with the Black Knight, zero ohm resistors were put in to make the switches work better---because of all the fast switch closures on that machine. If you do not have an actual zero ohm resistor you simply use a jumper...an office staple is perfect...just the right size. We modify every driver board that comes through TNT....which has been hundreds of driver boards over the years! You do NOT have to do it...but why not? Have I noticed a difference? really impossible to tell. I have gotten in many games NEWER than Black Knight that have had older drivers put in without that mod by previous owners. So we simply update every board.