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There are two types of tachometers that can be installed on your bike. Where the tach signal wire is connected depends on the type. Do you know the brand and model of your tach or do you know whether it is a data bus type or a pulse type?
A data bus tach connects to pin number 2 (serial data) of the speedometer plug.
A pulse tach connects to pin number 3 (tach signal) of the ECM plug.
Power and ground can really come from about any switched circuit but splicing into the speedometer power (orange/white) and ground (black) is the simplest.
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