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Author Topic:   Tachometer Wiring
Lyle g posted 11-28-2006 11:03 AM ET (US)   Profile for Lyle g   Send Email to Lyle g  
[Seeks information on wiring tachometer, particularly an OMC brand.]
an86carrera posted 11-28-2006 12:36 PM ET (US)     Profile for an86carrera  Send Email to an86carrera     
The blue [conductor] is for the light and black [conductor] for the (-).


Tom W Clark posted 11-28-2006 07:20 PM ET (US)     Profile for Tom W Clark  Send Email to Tom W Clark     
Strictly speaking you only need three wires to make a tachometer work.

Power (battery +) usually switched through the ignition switch. PURPLE (VIOLET, if you prefer)
Ground (battery -) BLACK
Tachometer pulse sender GRAY

To make the optional instrument light within the tachometer work, connect power, switched through (typically) the navigation lights BLUE

jimh posted 11-28-2006 09:46 PM ET (US)     Profile for jimh  Send Email to jimh     
The general color coding of the wiring used by OMC is given in an article I wrote for the REFERENCE section. Please see

Marine Wiring Color Codes

for guidance on wiring color codes.

The general arrangement of an outboard engine tachometer will be to have terminals with the following legends, uses, and associated wiring:

I = ignition, a +12 volt source which is provided by the ignition switch when in the RUN or START positions; the VIOLET conductor

G = ground, the 12-volt common or battery negative; the BLACK conductor

S = sender, a half-wave rectified signal from the engine's battery charging winding; the GRAY conductor

L = lamp, often supplied via a switch and in common with other instrument lighting; a source of +12 volts to illuminate the instrument; the BLUE conductor

Some OMC tachometers are wired directly to a harness with a connector. The connector mates with a matching one in the remote control wiring harness.

Lyle g posted 11-29-2006 08:41 AM ET (US)     Profile for Lyle g  Send Email to Lyle g     
thanks every-one use heat shink connectors made all the connection,works great.I'am guessing the last time it was hooked up was in 1995.

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