Tachometer help

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SOTech - 02 Sep 2008 07:22 GMT

hello everyone! I am new here and I have a quick question about
tachometers. I have a boat tachometer that I am trying to hook up and
test but it isn’t the normal 12v, ground, and signal similar to
vehicles. I was hoping someone here could provide me on some insight
on how these work. I greatly appreciate any help.

Here is a link to the rear of the tach.
http://www.flickr.com/photos/20166103@N05/2761111888/
[editor: picture validated as of date of this post]

Thanks,
Mark

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Bruce in Bangkok - 02 Sep 2008 12:05 GMT

> hello everyone! I am new here and I have a quick question about
> tachometers. I have a boat tachometer that I am trying to hook up and
[quoted text clipped - 8 lines]
> Thanks,
> Mark

If the tach reads RPM from a tap on the alternator then there will be
three connections to the instrument. Plus, Neg. and input or signal
which is the connection to the alternator.

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Cheers,

Bruce in Bangkok

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Larry - 02 Sep 2008 17:44 GMT

>> hello everyone! I am new here and I have a quick question about
>> tachometers. I have a boat tachometer that I am trying to hook up and
[quoted text clipped - 12 lines]
> three connections to the instrument. Plus, Neg. and input or signal
> which is the connection to the alternator.

That must be it. It only goes up to 4000 RPM so it must be for a diesel.

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Richard Casady - 04 Sep 2008 17:36 GMT

>>> hello everyone! I am new here and I have a quick question about
>>> tachometers. I have a boat tachometer that I am trying to hook up and
[quoted text clipped - 14 lines]
>
>That must be it. It only goes up to 4000 RPM so it must be for a diesel.

Tell our Turbocraft jet boat. 3300 RPM with the factory Graymarine,
3700 with the Buick we swapped in. Original engine had a mechanical
tach. Not hard to figure out the hookup. Nice thing about the electric
ones is that you can have as many of them as you like for the same
engine.

Casady

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Boat Forum / Electronics / September 2008

Tachometer help