You're right, it shouldn't affect the bike's tachometer, but is is essential to get the throttle position calibrated with the PC. If the PC software is not showing 0% throttle when the throttle is closed and 100% when it's wide open the fuel trims for each rpm band on the PC will not match the bike's actual rpm.

If you run the bike connected to a laptop with PC software running you will also be able to check if the PC is receiving a signal from the crank position sensor.

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