It should bolt right on to the steering wheel adapter. The adapter should take the splined stock steering shaft and "convert" it to a six screw pattern for Sparco/OMP steering wheels. I'm using an NRG adapter for the 240sx. If you have a 3-bolt adapter then you either need a 3-to-6 adapter plate or a new steering wheel adapter.

I can take a pic of my setup if you want.

David