Originally Posted by mark taylor
JUST RAN A SEPERATE WIRE FROM PIN 21 AND CUT THE TACH WIRE AT CLOCKS AND WIRED IT STRAIGHT TO CLOCKS.
EXACTLY THE SAME HALF REVS SO ORIGIONAL WIRE TO CLOCKS IS PERFECT.CHEERS MARK
Excellent, so it therefore must be either an issue with teh tach or with the ECU, as i originally told you on the phone. Fire it back and lets just fit a new driver to save any messing about mate.