They suggest the 752-600 kit, so that's what I ordered. Two important notes on that: The 752-600 kit DOES include the proper tach wire, but comes with a radiator hose fitting as a temp gauge, which obviously doesn't do much good on an air cooled bike.
Question: do you know what size temp gauge they sent? (25mm? 19mm?) and if it will fit the water cooled bike (such as my S4)? I'm about to order one and i was wondering if you happened to know. Thanks, and awesome writeup!