Interesting? If you're getting an rpm reading on the PC software but not at the dash I'd check the crank position sensor connector as you mentioned. Being a piggyback type, it's possible the the PC's connector (which is first in line to receive a signal) is making good contact but the ECU one isn't? Maybe it's not snapped together fully?

But then, you wouldn't expect the bike to run if the ECU wasn't receiving a signal from the crank position sensor? Very strange.

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