I'm sorry for not perfect english. In time I'll do a good quality translate. If you could not get anything please feel free to contact me in comments. I will answer you as soon as possible.
Code nozzles from Nissan: 16600-AW40A.
Code injectors on catalogs of manufacturers (Denso): 095000-5130.
Externally, apart from having two calibration contacts, nozzle looks just like Denso injector from Mitsubishi.
In the photos below you can see that these two gauge pins are connected with a certain device inside that tells the engine calibration information. Further personal guess the author of these lines on the basis of information from the global network on this device: there first put resistors certain resistance, then went to install the chips, which is encoded calibration information. And then realized that any chips and resistors-complete crap, new injectors were already with two contacts, and calibration information started to write on the plastic in the form of a sequence of digits and a QR-code. Maybe to the people themselves once again not climbed, and went to the service. After all, without a special instrument for registration calibration code is not to change the nozzle. Rather it is possible to change, but not the fact that it will work well.