Get a multimeter, set it to resistance and measure (without the motor connected) between each phase and the battery wires (in turn). If any of the phases register less than a few thousand kilohms to the rail (+ve or -ve) then the FETs have failed in that phase and you risk blowing the motor or ruining the speedo beyond repair (as it might be salvagable in its current state)
Hope it helps,
Ian
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