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is it carb or sfi you will have a green wire on you loom plug on the bulk head this then would go to a suppressor on the nearside wing just near the strut top out of the suppressor comes a red and green wire this is connected to the eidis and thus runs your tacho or you could of course splice into the wire were it come out of the loom plug on the clocks (only one green wire so you cant miss it)run a fresh wire to the coil pack and splice it to the red and green wire this will give you a good voltage signal to run your tacho make sure all connections are properly soldered though.