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Author Topic:   Tachometer Connection for 1961 Evinrude Outboard
Binkster posted 05-15-2011 10:17 AM ET (US)   Profile for Binkster   Send Email to Binkster  
I would like to hook-up a tachometer on my antique boat. Its powered by a 1961 Evinrude Starflite 75-HP, standard shift [distributor] [ignition] outboard. I`m using an old OMC tachometer. I found an old post by the late Sal Dimercurio that says to set the [tachometer's calibration adjustment] to 6-pole. There is a gray, a black, and a blue wire coming out of the tachometer. On the wiring harness I have three wires not being used at this time: gray, brown, and black. I think that brown is for a temperature gauge or lamp. I think that the gray wire is the tachometer wire, and black is ground. Is the blue wire a lamp for the tachomter? Will it work if I hook gray to gray, black to black, and use [the setting for] 6-pole. I have a manual but it is not clear (to me).
seahorse posted 05-15-2011 10:27 AM ET (US)     Profile for seahorse  Send Email to seahorse     
The tach for that motor has to be an automotive or stern drive style due to its magneto or battery ignition with a distributor cap.

set it to 8 cylinders as it fires 4 per revolution

Binkster posted 05-15-2011 06:43 PM ET (US)     Profile for Binkster  Send Email to Binkster     
The most poles I've seen on an outboard tach is 6 poles. My 4 cylinder Chrysler was set to 2 poles according to the manual. I don`t know what the tach setting for my 3 cylinder 25 Merc. 4 stroke is.
seahorse posted 05-15-2011 11:42 PM ET (US)     Profile for seahorse  Send Email to seahorse     

They did not have permanent magnet alternator type outboard tachs 50 years ago, you need one designed for the igntion system on your 1961 motor. More modern motors use the alternator for the tach pulses.
Binkster posted 05-18-2011 01:14 PM ET (US)     Profile for Binkster  Send Email to Binkster     
I guess I misstated my outboard. It was the first year for the Unicharger,(some sort of alternator) I used the same tach I used on my '72 105 Chrysler race motor with Magpower. I set the tach at 6 poles and found an old post in the archives by jimh on wiring the tach so everything is good now. Thanks

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