Any car place like Autobarn, you just want a HICAS compatable boss to suit R33, i think about $70 or something. Its the big round thing your steering wheel bolts to and then u bolt that to the car, two plastic tabs will sit inside it if they havent been broken off. It measures the turn angle of the steering wheel used during HICAS calcs on the R33. R32 is hydraulic on the other hand.
Some people also cut the speed signal wire so the ECU doesnt speed limit the car to 180kph, this will also cause your HICAS to stuff up (used in calcs).
Has anyone tried pulling out the hicas sensors and cleaning the dust off?
If its a/market it could be slightly out of tolerance also???