87 Johnson 90 HP Outboard Tach?

frankk

Seaman
Joined
Aug 31, 2003
Messages
63
I just purchased a Lil Hobo which has this outboard on it. Is there a tach output on it? How can I determine if I can hook up a tach to it? Frank in Antioch, IL
 

Daviet

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Sep 24, 2008
Messages
8,958
Re: 87 Johnson 90 HP Outboard Tach?

Does this contol look like yours?
#50 is the plug for the tach, do you have one on your control box, if so the tach plugs into it.
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Barnacle_Bill

Admiral
Joined
Feb 8, 2004
Messages
6,469
Re: 87 Johnson 90 HP Outboard Tach?

If you don't have that connection you can still add a tach. Its just a little more complicated.
 

emdsapmgr

Supreme Mariner
Joined
Dec 9, 2005
Messages
11,551
Re: 87 Johnson 90 HP Outboard Tach?

OMC provides a gray tach signal wire to the control box for running one. It may feed the tach plug that Daviet mentioned, or it may just be curled up inside the control box-depending on the year of the box.
 

Daviet

Fleet Admiral
Joined
Sep 24, 2008
Messages
8,958
Re: 87 Johnson 90 HP Outboard Tach?

If you don't have the 3 wire plug on the control box as in the parts breakdown in post #2, you are going to have to open the control box and look for a gray wire as emdsapmgr mentioned in his post.
 

frankk

Seaman
Joined
Aug 31, 2003
Messages
63
Re: 87 Johnson 90 HP Outboard Tach?

Thanks guys... something to search for when I get back on Sunday.. So sounds like if all I have is the gray wire then I use discrete wiring / resistor / meter then. No problem with that. Thanks for the support
 
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