Right I think this data is believable
The vertical resolution is pretty dreadful - far too close to the quantisation step sizes - so I need to work out how to get that a bit better. I hope I don't have to amplify the signals before they go into the scope (shouldn't have to - but hey this is cheap stuff)
All the horizontal plots are in seconds
Rough measurements at idle (didn't measure the O2 output because those pins were gonna touch)
This is a strange one - front TDC sensor looks like it "blips" twice.
I'll have to check this out to be sure - the length of the measurement isn't long enough to really see that here.
This has the worst vertical resolution - I couldn't find the calibration value of the inductance probe (found it now - see above)
I got lucky seeing this one pulse on cylinder #1 within this measurement length.
If you look at the top graph you can see the four blips that come off the lumps on the flywheel on the M102. Four blips = one whole revolution of the crank.
Looking at the time of those blips you can see they happen within 0.7 seconds - that's about 14Hz (so 14 crank revolutions in a second) - that's about 840 rpm - idle speed which is what I did the measurement at...