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Author Topic:   Deduce Purpose of Wires From Picture
voltzgj posted 09-14-2011 08:36 PM ET (US)   Profile for voltzgj   Send Email to voltzgj  
Hey all--I am trying to connect a new tachometer to a 2006 Mercury 40-HP EFI. When the previous owner re-powered my 13-foot Dauntless he did not do this. I see there is a wiring harness and then about five other wires coming out [from somewhere]. [Do] I need the harness to connect? Or, [do I] just use those other wires to connect a new tachometer? Let me know what you think after looking at this picture.
jimh posted 09-14-2011 09:40 PM ET (US)     Profile for jimh  Send Email to jimh     
I followed your hyperlink but I could not make any inference from the picture.

Most outboard engine manufacturers use a consistent coding of the insulation color of the wire in their harnesses. I have collected and organized information about wire insulation color as an indicator of function in outboard engine wiring. See my results at

voltzgj posted 09-14-2011 10:00 PM ET (US)     Profile for voltzgj  Send Email to voltzgj     
Thanks Jim. Those wires are coming out of the bottom of side-mounted control box. Do I need to plug something into the wire harness? Or, could I install the tachometer to those other wires? I am guessing the harness is for Mercury gauges and the other are for gauges from other manufacturers or something.
jimh posted 09-15-2011 08:39 AM ET (US)     Profile for jimh  Send Email to jimh     
It would be typical that on an engine wiring harness there is a pre-wired connector to which a mating connector can be attached and used to conduct the electrical signals to gauges. The wire colors are not visible and you have not given information on the wire colors. Generally you can deduce the function of the wires in the outboard engine wiring harness by the color of their insulation.
Jefecinco posted 09-15-2011 09:33 AM ET (US)     Profile for Jefecinco  Send Email to Jefecinco     
If your setup is the same as on on my EFI four stroke you can get a harness from Mercury which will connect the existing engine wiring to various analog gauges including a tachometer. I got mine from BassPro Shop for about $40. You can beat the price on-line but as they are about 1/4 mile from my home I try to use them.

Otherwise I believe you can buy a SmartCraft Tachometer for a lot more money, connect it directly to your existing wiring package, and enjoy other useful readouts. Did I say a LOT more money?

I suggest you speak with a Merc Tech before proceeding. If it will help I'll check the packaging and provide the SKU to you.


voltzgj posted 09-15-2011 10:24 AM ET (US)     Profile for voltzgj  Send Email to voltzgj     
Jefecinco, I don't think I will be spending the 700 or so dollars for the Smartcraft stuff for a 13' Duantless but thanks for the info. I am actually going to the Cedar Point in water boat show tonight where the local BW and Mercury dealers have a booth and I hopefully can talk to them.

If you could get me that info it would be great. I really want to get some gauges working again, I hate running without knowing my RPMs.

Jefecinco posted 09-16-2011 10:40 AM ET (US)     Profile for Jefecinco  Send Email to Jefecinco     
Will respond this PM.
Jefecinco posted 09-16-2011 02:11 PM ET (US)     Profile for Jefecinco  Send Email to Jefecinco     

The Quicksilver part number for the harness is: 84 892990T01. The nomenclature is: Harness Asy - Analog Gauge. The price was $35.00.

I hope this works for you.


voltzgj posted 09-16-2011 02:26 PM ET (US)     Profile for voltzgj  Send Email to voltzgj     
Thanks Jefecinco! That appears to be what I am looking for, I am going to check with a local dealer to be sure. Now I just have to plug that in and get the gauges and I will be good to go.

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