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Old 1 Week Ago
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Default Yamaha Multifunction Tach 6Y5-8350T

Hi All,

Just wondering if anyone can help. I have been given a Multifunctioning Gauge (6y5-8350T not sure if this is a -90 or -82, -83) but I'm not sure how to wire it to my Yamaha 1997 2 Stroke 40VETO.

I've heard there are 2 types of gauges, one for older than 2004 and another which if for 2005 or newer. I believe I have the one for newer models as the person had a 2015 F40LA but I could be wrong.

Does anyone know what extra wiring harnesses I'll need and the part numbers? The gauge appears to have 8 wires, 4 of which are attached to a plug, while the other 4 are free. Do they just connect to the Control box (I have a 703-48207).

Also I'm having trouble locating the Trim & Oil plugs from the engine, are these easy to locate?

Any wiring diagrams and advice would be greatly appreciated.

Thanks,
Tom
Attached Images
File Type: jpg Control 703-48207.JPG (84.9 KB, 8 views)
File Type: jpg Gauge Wiring.JPG (95.4 KB, 8 views)
File Type: jpg Gauge2 .JPG (96.5 KB, 8 views)
File Type: jpg Control 10 pin wire harness .jpg (129.8 KB, 8 views)
File Type: jpg Control wiring2.jpg (119.2 KB, 7 views)
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Old 1 Week Ago
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The pdf link below is the best all-inclusive tach/speed instructions I've come across. All necessary gauge components are listed with part numbers, as well as instructions for installation.

http://www.mbcboats.com/perfbull/Yam...KitInstall.pdf

Follow the A, B, and C for locations for the engine side oil and trim harnesses

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Jason
1976 170 Aquasport***1998 S115TLRW

Last edited by Jason2tpa; 1 Week Ago at 01:15 AM.
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Old 1 Week Ago
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A 40VETO should be the equivalent of a USA 40TLRV. If you have power trim and tilt and an oil injection system. Parts and diagrams can be found here.
1997 40TLRV Yamaha Outboard Parts

You have a -90 tachometer. Intended for 2005 and later Yamaha's that have a two wire trim sender and single trim/oil connector.

The -90 tachometer has a trim gauge embedded within. Which is not usable on your motor being that it uses a three wire trim sender.

For the over temperature function and the low oil warning functions to work you are going to have to string some wires. Possibly cut and splice. What do you want to do?

The actual tachometer indication function will be relatively easy. A green wire in the ten pin harness to the control box connects to a fused harness that provides power, ground and the tachometer signal to the gauge. It looks something like this:
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Old 6 Days Ago
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Thanks guys for your responses. Much appreciated.

Boscoe, would the Trim work if I purchased an adapter harness (2plug to 1 plug) 6Y5-85335-10 along with the Trim and Oil Harness 68F-82553-XX-00 (pic attached).

I was planning on getting the above harnesses along with the 6Y5-83553-M0 (Will the harness with single fuse be sufficient, or will I need the dual fuse harness?)

I don't mind trying to wire up my own harness, but if it's a complex job, I would rather just purchase the required harnesses.

Thanks.
Tom
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Old 6 Days Ago
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The three wire sender on your motor uses a potentiometer. That potentiometer is normally provided 5 volts by different style Yamaha tachometers. The -90 tachometer does not provide the five volts needed by the sender.

A craft person might be able to buy a 12 volt to 5 volt regulator and use that as a means to provide the sender with the necessary voltage.

https://www.ebay.com/i/131199957529?chn=ps&dispItem=1
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Thanks Boscoe,

I'll see how I go this weekend and update.
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