There is still the output out of the gearbox! That's where you get the signal from. They would've had to modify the gearbox to get rid of it, and for no benefit. The wires will still be there, even if they don't plug into the race harness (although they probably still do, as the neutral sensor and a couple of other important signals come from the same place). It doesn't matter that there's no speedo readout at the dash (or even any speedo wire at the dash).
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