I have converted a 1992 auto nsx to 6 speed manual trans, I converted to manual steering at the same time. You can't just swap the power steering components, as the wiring harness is not isolated for the electric steering rack. You would have to swap the entire wiring harness at the same time. This would create alot of complications when you tried to use a na1 harness on a na2 car and a na2 harness on a na1 car. here is a list of parts that need to be swapped.
Ecu
Traction control computer
Entire wiring harness
Steering column
Steering rack
U joint between rack and column
Subwoofer brackets
Guage cluster
shift linkage