I just read all the info on the various links, and I have a question. Is there a NismoTronic ecu for OBD2 cars? Both of my P10's are 95's is why I ask. All the info I just read leads me to believe you are focused only on the 89-93 S13's & B13's which are OBD1.
BTW, if this was a dumb question realize I just don't know much about ecu's and tuning other than OBD1 has a blue plug and OBD2 has a white plug.