Just an update on my Z3 2.0 regarding tachometer stops working after about Six miles and ASC light comes on . Then when car stood and not running , problem corrected itself till next six miles approx and issue returns. I’ve fitted new crankshaft sensor new camshaft sensor , three new wheel sensors. And sent ECU away for checking, came back no faults. One more sensor to fit , if problem still persists, then send cluster away for checking. Hopefully will prove successful, if not running out of ideas