temp gauge wires

ok so i have an awesome new temp gauge im trying to fit…can someone please tell me which wires on the plug which plugs into the speedo unit i need to put into the new temp guage…i have two plugs on the back of it so im guessing two of the wire son the plug have to be cut and re wired….does anyone know the colours of them?! help apreciated…
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This may help . Haynes manual will have the correct wiring diagram for your car and this will help you identify the correct wire .

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