Hi Adam, thanks for you reply. The sensor is a 3 wire hall effect most similar to a rotax brand, running less than 1mm next to 36-1 tooth trigger wheel, (photo attached) seems to be consistent gap. ive got shielded wire running to the ECU and tested all clearances today and made sure of voltages at the plug for the sensor (12v supply and earth) . previously I had a link G4+ Atom but upgraded to the storm as I couldn't get wasted spark running properly on my v8 so went to sequential. I have attached photo of trigger 2 running off the cam also, thanks