I'm trying to wire up my gauge panel, and I have a 2 1/16" VDO Tach part number 0 515 010 444 and it has 3 dip switches on the back. I have attached a picture of what the instructions say to do, but I do not understand what "Rotax" and "Ducati" mean. Can anyone shed some light on what setting I need to use for my 6 cylinder? I will be using the factory signal tach wire source. Thanks!