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Author Topic:   tach
gvisko posted 08-26-2003 10:57 PM ET (US)   Profile for gvisko   Send Email to gvisko  
The 13 I just bought has a 96 johnson with power tilt and trim 40hp 2cyl but no tach. could someone tell me how I should wire and install one?


thanks george viskovich

skookum point posted 08-27-2003 12:30 AM ET (US)     Profile for skookum point  Send Email to skookum point     
Assuming you have the side mount OMC control box - on the aft face of the box, under the key switch you should see a half-round 3 pin receptacle. The OMC tach wiring harness plugs in there. I just happen to have a new, unused, still in the package OMC tach with the OMC wiring harness. I bought it at from an OMC dealer in May 2003 for retail price of $135. I didn't use it because I decided on a (more expensive) System Check tech instead. I'll sell it for $100 delivered, if you are interested.
gvisko posted 08-27-2003 07:25 AM ET (US)     Profile for gvisko  Send Email to gvisko     
I will check it out today and if
i do I will buy it from you . what color is it? gvisko
Over the LINE posted 08-27-2003 09:30 AM ET (US)     Profile for Over the LINE  Send Email to Over the LINE     
I don't want to mess up skookum's sale, but I bought a used tach from my OMC mechanic for $ 20.00. The wiring consists of plugging the unit in.

Good Luck

skookum point posted 08-27-2003 10:40 AM ET (US)     Profile for skookum point  Send Email to skookum point     
Overtheline - You are correct, used instrumentation is always cheap. Personally, I believe tach readings are important enough to justify a new unit. Also worth mentioning, I have experienced odd readings from a Teleflex tach when wired to an OMC - and at least two others on this forum have reported the same thing. Best to use an OMC tach with a OMC motor I think.

gvisko - black with red pointer, will e-mail photo if you like.

Over the LINE posted 08-27-2003 11:03 AM ET (US)     Profile for Over the LINE  Send Email to Over the LINE     
Skookum, it was an OMC tach. You are right used can be a problem but since my OMC mechanic installed it (and I assumed he wanted to keep me as a customer) I figured it would work fine (and it did). I also had problems with an aftermarket tach on another OMC motor, so I would not go that way. Like I said before, not trying to screw up a sale just passing on my experience.

Good Luck

Bigshot posted 08-27-2003 11:19 AM ET (US)     Profile for Bigshot  Send Email to Bigshot     
I have had problems with few tachs but I always run OEM. If not going OEM, get Gaffrig gauges, they are the best and sometimes not much more than OEM. I stay away from teleflex and Faria.
gvisko posted 08-27-2003 09:17 PM ET (US)     Profile for gvisko  Send Email to gvisko     
I dont see the plug on the side mount just a wire harness
which I will trace in the morning .I do see 3 wires
that are not connected and have caps on them. this motor
has system check installed . I will take your advise nick
and go oem if I can find out how to wire it myself


george viskovich

skookum point posted 08-28-2003 01:41 AM ET (US)     Profile for skookum point  Send Email to skookum point     
gvisko - If those capped wires are purple, gray and black - they will be your tach wires. In this case you don't need the harness, just the tach. OMC changed to a new wiring design in 1996. With System Check you have 3 options: use the OMC tach with System Check built in; use a normal tach with a seperate System Check Gauge (2" diameter I think); or use a normal tach with the OMC audible alarm. If you don't already have the 2" gauge then you probably have the audible alarm instead.

I have the color coded wiring diagram for 1997 40-50hp motors. It folds out too big for a scanner but could be scanned in sections or maybe digital photo if that would be helpful. I just updated my wiring from the pre-1995 OMC type to the current type so I have had some recent hands-on experience with this.

gvisko posted 08-28-2003 06:39 PM ET (US)     Profile for gvisko  Send Email to gvisko     
Thanks snookams I found the grey,purple.and black wire as yo
said just hanging there . I do have the 2" round system
check already installed . do I just hook up the new oem
tach to these wires?

thanks again george v

gvisko posted 08-28-2003 06:41 PM ET (US)     Profile for gvisko  Send Email to gvisko     
sorry for getting your name wrong skookum

george visko

Bigshot posted 08-29-2003 10:48 AM ET (US)     Profile for Bigshot  Send Email to Bigshot     
Yes George or aftermarket if you chose. For OEm, try E-Bay.
skookum point posted 08-29-2003 12:52 PM ET (US)     Profile for skookum point  Send Email to skookum point     
Yep, real easy hookup. Black wire is ground, Purple wire is 12 volt (pos), and Gray is pulse. Set the dial on the back of the tach to "6".

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