Rotax rev counter: wiring diagram

[Wannabe pilot]

I have recently obtained a Rotax rev counter, but have no idea how this is wired up. I would like to install it on my Windlass. There are only two connections on the back - marked positive and negative. Do anyone know how the wiring should be connected, or maybe have a wiring diagram that can be posted?
Any help would be appreciated.

[Duck Rogers]

Sure.........negative to ground and positive to the GREY wire coming out from the stator coil. Assuming you have a Rotax 2 stroke engine in that Windlass

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[Wannabe pilot]

Thanks - yes, Rotax DCDI

[Wannabe pilot]

Problem!!! ------- I wired the rev counter up according to the diagram, but now the revs it show seems to be at least double what they should be. It revs up easily to 8000, which of course cannot be. I noticed that when I do mag checks, the revs show no reaction when the one switch is switched of, but decrease about 1000 rpm when the second switch is switched off. This must be something to do with the double ignition, I think, but how do I rectify it? I picked the only grey wire I could see - to me it seems to be coming from the magneto and not the stator. As far as I could see, there are no grey wires coming from the stator, unless I missed it in the harnass?

[German]

Check your earth

[Duck Rogers]

You sure you have a tacho for a dual ignition?
There are different ones for dual and single ignition

Yip, that's the right grey wire. There is only one