could be turbo or non, manual or automatic. So pretty much any z32 ecu between 90-93... The newer z32's have a slightly different ecu which doesnt work.
Here's a good thread on it, requires repinning 8 or so wires on your ecu harness to compensate for the change in firing order, o2 and knock sensors.
http://forums.nicoclub.com/rb25-with-z32-ecu-t359056-80.html