thats the shaft you swap over when going from a bulging headlight to slitty eyed headlight power steering unit swap over
the splines are different where it sits on the steering rack through the bulkhead
remember to locktight the shaft bolt up and note which way you turn the shaft on the bench to access the nut,be sure to return to where it was prior to fitting to car
make sure wheels are straight ahead during complete procedure
you may need mes to recalibrate once done
make sure you use the motor and ecu from your car once swapped over
the torque switch is internal on the big box the motor goes in to
its basically a long wire with copper strips touching it,think of how the trams at blackpool get their power