1990 70hp yamaha tach

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philo600

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May 11, 2006
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i have a 1990 70hp yamaha model #70ETLD. it is mounted on a pontoon boat. there is a tach in the instrument panel, but it's not hooked up. it also has an indicating light on the tach for low oil. does anyone have a wiring diagram out of a manual? any help is appreciated.
 
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Ray Neudecker

Lieutenant Commander
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May 25, 2004
Messages
1,656
Re: 1990 70hp yamaha tach

The older three cylinders required a conversion kit to allow the tach to work properly even with a Yamaha guage.Switched hot is yellow, black is ground and the tach sending wire is green in the Yamaha harness. No clue what the guage wiring is since you don't mention the brand.
 
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philo600

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Joined
May 11, 2006
Messages
4
Re: 1990 70hp yamaha tach

the tach is a yamaha tach...the strange thing is the trim level on the tach works, but the rpm and oil level do not...i'm not sure if this helps or not.
 
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