I'm trying to put a tach on my '79 50hp Johnson (which has no alternator),
and all I seem to be able to find are tachs that require an alternator
hookup. Does anyone know if it's possible to modify one of those to work for
me, or know of a tach (other than the TinyTach clipon, I want a dash mount
gauge) that will work? Any help/tips are greatly appreciated.