That connector is for the dropping resistor for the transmission fluid pressure regulator. Unplugging it increases transmission fluid pressure, which leads to harder, faster shifts.
But the upshift RPM isn't regulated by fluid pressure. In these cars it's regulated by the automatic transmission's computer.
6000rpm is a pretty good shift point, actually, considering the KA's stock powerband. But barring that... If you want the car to go to redline, shift it manually.
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