Yes that will be your signal wire,
You will need to connect green wire from the bike and the green wire from the taco, together.
What type of tachometer do you have or planing to buy ?
There are 2 types in it . 1] The green wire connection one, (this is mostly analog meter) 2] The sensor based (This is a digital display model)







Rather than improving on these parts if you guys have any additional tips on improving the performance, kindly enlighten me

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