Hi everyone, recently bought a 2012 Meriva b exclusiv 1.7 auto. Lovely little car but I want to add the mpg, range, etc to the instrument cluster. We have the correct display (mid sized one) and also the relevant buttons and toggles on the indicator stalk. How do I go about getting this info on the display. Is it just a case of plugging it in to an opcom unit or do I need professional assistance. Thanks.