2007 ST TDCi Speedo needle has all but stopped working. Sometimes it sits all the way around the dial not registering anything, just dangling at the bottom, other times when doing what we know from our Tom Tom to be around 70mph, the needle will sit at 100mph !?!? most of the time though it...

Hi there, I am new to this forum but found some useful information on here before I bought my car. I got myself an 05 reg ST155 on Sunday - so far so good, though I am still figuring out all the toys. The day after I got it the illumination for the information display (average speed, temp...