I’ve just bought a 52 plate A170 CDi Avantgarde... on the whole Im happy with it however it appears I have an electric problem. The 'SRS' light keeps coming on intermittently and then rev counter died completely. After a while it came back on again but only registered 500revs for the rest of the journey. Once I had stopped and restarted the car the rev counter was working again! Are these problems linked? Has anyone any ideas?