rev counter help

Hi guys, i know this has been posted a million times, but i got lost in reading a thosand posts showing diffrent ways of doing it, so i will just ask it. Can somebody explain to me how to wire a rev counter on my 1l 1997 k11, the car is lhd and has no cig lighter if that matters. Im not too much into electric stuff and english is not my main language, so i will prefer more simple explanations. My rev counter has 3 wires - red, black and green (im posting a picture of the gauge manual).
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