how to make trigger setting for VW polo

a 2 channels Oscilloscope is a good tools for trigger setting(More than 2-channels is a bit expensive). for this car, the CAM and CKP singal are both Hall type. the factory ECU work normal, so I can get the spark signal with Oscilloscope CH1, I also connect the CAM and CKP singal to LinkECU and try to modify some setting and check the sprak output(link ECU) Oscilloscope CH2 . a scanner is connected to the OBD2 and get the data stream from factory ECU. I can get the spark degree. when I setting the same spark degree in G4+ ECU, you can compare the Oscilloscope singals between factory and G4+ ECU . I can correct the offset value to get same spark singal output CH1 and CH2. it is my solution.

:-)