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Some gearboxes may already have electronic sensors to drive the factory tacho but some may only have a cable drive to the tacho or no tacho at all.
Not sure where i read it but someone drove the tacho in their ev using a hall effect sensor mounted in the hole where the starter motor used to connect to the flywheel. There was some protrusions on the flywheel that allowed them to get a number of pulses per revolution of the flywheel.
Of course that would only work for those people that kept the flywheel and clutch. And as long as there was some anomaly on the flywheel that could trigger the hall sensor.
If required a small magnet could be bolted to the flywheel but keeping the flywheel balanced may be a challenge.
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