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Hook it to one of the coil wires. I can't remember what one is correct but you can always touch it to one of them and see if it is working. If not then try the other one. It won't hurt the tach being connected to the wrong side of the coil. The other option is connecting it to the coil wire coming off the ECM but that is a real pain to get to so I say hook it to the coil and save a lot of hassle.
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