I'm stuck on two wires!! I have put a c20let in n I'm struggling on where two wires go! They are.... Black wire and a brown wire, located behind the headlight switch. The black wire if I give it 12v powers the dash clocks up n the brown is a earth! Cannot find where they go as everything seems to work other than clock temp n petrol gauge! Any help or photos of wiring would be massively appreciated. Thanks