1992 2.5 offshore tach hookup

Yardsale

Recruit
Joined
Jul 31, 2024
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4
Has anyone hooked up a quicksilver tach to a 2.5 offshore? I could not fin a plug for a harness. thanks
 

Dukedog

Captain
Joined
Oct 6, 2009
Messages
3,439
should be a gray wire under tha dash.. tha other end should be plugged into a gray wire on one of tha rec/reg..... thats tha "signal" circuit... did tha boat not come with a tach or are you jus now adding one?
 

Yardsale

Recruit
Joined
Jul 31, 2024
Messages
4
should be a gray wire under tha dash.. tha other end should be plugged into a gray wire on one of tha rec/reg..... thats tha "signal" circuit... did tha boat not come with a tach or are you jus now adding one?
Boat never had a tach. Motor and control box were installed at a later date. My OMC has a plug for a tach harness on my other boat. I was hoping Mercury had something similar.
 

Dukedog

Captain
Joined
Oct 6, 2009
Messages
3,439
tha merc stuff should have it!... what harness and controls are ya workin' with?.. motor year?
 
Last edited:

Dukedog

Captain
Joined
Oct 6, 2009
Messages
3,439
merc harness, both boat and engine harness will have wiring for a tach.. it will be a gray wire for signal.. from reg/rectifier to tach......

copy and paste tha below in your address bar and enter... it will ope a pdf that has all you will need............

file:///C:/Users/allys/Downloads/Old%20Downloads/MODELS%20135-150-175-200-225%201992%20and%20Newer%20_%20135-150-150-%20XR6-150%20Magnum%20III-150%20EFI-175-175%20EFI-.pdf
 
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