I thought those electric shifts were 70's rather than 60's. a pal had a Rude triple, 55 I think, that was electric shift, but I can't remember what that was badged as 'Lectrashift' I think....Eric???
Our 1965 40 Evinrude Big Twin (like the one in the first pic) had the standard two cable shift throttle system. The "luxury" Lark 40 had Selectric Shift. We had that system on our 68 85hp Starflite X and it worked flawlessly for years.
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I thought that having more patience was a result of my getting older. Turns out that I just don't give a sh*t.