Hi can anyone help please I've had a new clutch fitted on my diesel 2008 Ford focus 1.8 I've had it changed from a dual mass to a single mass flywheel with all the necessary items to convert it to a solid mass but now the car won't start I was told could be the crank case sensor so brought a new one still no joy tried easy start it started but over reved and then just cut out again and still no start all wires etc are correct and present I've been told could be the flywheel as the new one have teeth on the back for the semsor but old one is a square ring type would this be the case or am I missing something only surly it would still work as its sold for the car?

Any ideas and help would be much appreciated