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Author Topic:   1982 OMC Outboard Tachometer Wiring
fisher801 posted 10-05-2007 01:09 PM ET (US)   Profile for fisher801   Send Email to fisher801  
Hello everyone. [Seeks] detailed instructions on properly wiring a Teleflex tachometer for an 1982 Evinrude OMC outboard. I have the instructions, but for some reason the wire colors on my existing wiring harness do not jibe with what the instructions say. I have two gray wires and one yellow wire. This set up I have is an 1082 Sport 15. The console is the factory mahogany box set next to the starboard side. Thanks to all who respond.
Casco Bay Outrage posted 10-05-2007 02:13 PM ET (US)     Profile for Casco Bay Outrage  Send Email to Casco Bay Outrage     
Have you reviewed this?

jimh posted 10-08-2007 08:57 PM ET (US)     Profile for jimh  Send Email to jimh     
It is just about universal that a tachometer requires the following:

--12-volt positive from battery
--battery negative
--tachometer pulses from engine

The tachometer pulses are usually derived from the input to the rectifier and consist of a half-wave pulse output from the alternator winding. The number of poles in the alternator determines the relative frequency of the pulses related to the crankshaft rotational speed.

The use of a wire with gray insulation is just about universal for the conductor carrying the tachometer pulses.

The battery positive and negative are usually identified by red and black insulation. A positive voltage that is switched with the ignition is usually used. This is usually carried on a violet colored wire.

If the gauge has illumination, it is normally wired with blue insulation on the conductor.

fishinchips posted 10-18-2007 03:22 PM ET (US)     Profile for fishinchips  Send Email to fishinchips     
I helped fisher801 with his problem; new tach is operational. Troubleshot his wiring, identified what he needed, and wired it in from there.

Ken (170 montauk / 22 hydrasport wa)

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