Hi, I bought a pair of genuine fog/drl light housings that fit in the front bumper of my 2011 2.0d bluemotion passat estate , My goal is to convert the standard drl system to fog/drl , I know i need also fit a new dash switch (switch has atm , one fog position , rear , needs two fog symbols front and rear displayed) but what else is needed , what wiring will i need and will the onboard computer display (centre of instrument cluster) need recoding ? Many thanks for replies in advance .