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My '77 850 commando is fitted with an electronic tacho from which 3 wires exit to a connector block. Light green , black , red. The light green is connected to the right hand coil, but where do the other two go ??
tacho wiring
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Here you go…
Green is the pulsed signal.
Red and black are the positive and negative power to the tacho.
So connect the red wire to ground.
Take the black wire to the white that goes in the back of your ignition warning light.
That way, your tacho will go on and off with the ignition key.
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here is an image of the tachometer.Hemmings brand.