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on my motorcycle it's different. (for tiny tach: black= ground, red=+12V, Blue=dash light+12V, and green is signal)
Sometimes, if the tach has a back light it's easy to find the wire.
Usually the signal cable can get signal with 12V. so if you rapidly touch with the signal wire the +12V line, you may see the RPM's going up on the meter, and know it's the signal wire.
then there's the internet, and loads of good people that are generous enough to aid the common man with their illustrations and posts :-)
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