Reply To: tach for ’66 Evinrude 40hp Lark

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April 3, 2021 at 5:44 pm #235564
Don
Participant

    US Member

    Sorry, I really don’t think this tach will work on your old 40hp. This tach uses pulses from the alternator to signal RPM. The ABC designation/adjustments are for different styles of alternators… Your 40hp has a generator…