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What colours are the wires? I assume one is black, one is red and one is.... green? yellow? white?

Either way, one will go to live, one will go to ignition and the black/brown will go to earth. Work it out from there.

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Black, red, yellow. If i connect to permenant live wont it stay on all the time and drain my battery?

no because that isn't how it works. The signal it is measuring is your permanent live but the LCD plus backlight is powered by your switched live.

Hope this helps.

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