Re: Airguide tach for ’79 Evinrude 35 question

[jerry-ahrens]

I don’t think your old Airguide tach will work. Does your 1979 engine have a charging system? Look for the charging system rectifier located on the Starboard side of the powerhead. it’s a small round piece with a grey, red,
and yellow/grey wires coming out of it. If it has charging capability, the harness tht runs up to the ignition switch should contain the grey ”signal” wire within. Look up a modern tachometer that’s suited for a 2 cycle gas outboard,
and your set. FWIW, on the back of the tach, you will have a grey signal lead, a black engine ground lead, and a red positive (hot) lead.