Renualt Master dash and rev counter fault

Hi All.



I have a very strange thing happening to my van at present and hope someone can help.



Sometimes the warning lights come on without a reason (stop light and transmission light flash and rev counter goes up and down like a mad man) and mainly happens when doing over 60mph. But also when restarted when hot it does the same sometimes though.



I have also noticed that if I feel roll with the clutch down then the rev counter will go back to idle and then it is fine as long as I don't do over 60mph.



I have replaced the camshaft sensor and wondering if it would be the Crankshaft sensor now.



Anyone got any idea's

Thanks

Mike