I am in the process of installing an AIM MXL dash/datalogger. Tapped into the grey wire with blue tracer coming from C1 (Tach output), but AIM is not seeing any signal. The signal needs to be a square wave, anyone know if that's the case with the RPM signal from the ECU? These are my options as per the manual from the ECU through a square wave signal (from 8 to 50 V); from the coil: low voltage input (from 150 o 450 V). Thanks!!