As title mines just stopped working just drops to 0 or flicks round to 160mph .Ive changed the sensor on gear box and it cost £125 pounds at Fords was fine for a day then went again .I did send clocks away and had them tested and they said they was fine got charged £70 quid for that .So im £200 pound down got no where so thinking of buying another set of clocks . Or another thing i read isthat there are 2 earths near air box that need cleaning up ive not tried this yet ill let you know but any other advice on what to check id be greatfull