TOPIC: Tachometer hook up for magneto BigTwin 35hp

I have an Airguide #653, that is supposed to be designed for my magneto ignition '57 Evinrude 35 hp. I got the tach itself, plus the control box. There are really no wires on it, so I have trouble when being told the yellow wire goes either here or there. It is rather self evident, that the + and - side of the gauge and the control panel each get a wire in between. But, what goes between the control box and the magneto? Where does it attach? There appears to be two leads that go to the engine, where do they go to. What gauge wire is to be used? Any help, please?

Perhaps a google search for

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airguide 653 module

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will get you somewhere.

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Might have to spend $1.99 to download instructions ??

Thanks, I will look for that place. I actually didn't think my post, posted. I messed with it for about 1/2hr. Again, thanks

A regular tach hooked to + and - and the trigger wire to the dist side of your ign switch and set on 4 cyl should work.