connected to all 3 of my scopes and all show a clear, HV, waveform pulse.
just be sure the ground is connected to battery MINUS. (protects you and your $$$scope)
and be sure not to be connected to bad spark wires, (cracks there) or near the end of any wire, end. (were actual HV is present)
Great product. end to end. have photos of signals but can not post them here, nice they are.
This is an easy way to trace a secondary ignition pattern on any oscilloscope. Be careful, make sure your plug wires don't leak or you might subject your scope to high voltage from the coil secondary.