Tachometer help

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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