Hi guys - I have a friend who just picked up a used 2013 Mastercraft 197. It's his first inboard and she's a beauty. The zero off gauge is shot so he's waiting for the dealer to get the new one in stock. With that being said he's doing some old school throttling and using the standard speedo gauge. The problem is the speed is off...... It's reading a good 5+ MPH to fast. We've done some googling and can't find how to exactly adjust the speedo. Anyone have a 2013 MC 197 and know what the process is? Just trying to help a friend out.