Nytro Impulse Prologger

Hey guys, I'm installing a Prologger on my impulse nytro that has the standalone system. I'm a bit confused concerning the wiring of the Prologger tach adapter. I have instructions from Paul stating to wire the purple Prologger wire to the nytro main Grey plug, but on the Prologger tach adapter instructions it says to connect the Grey wire of the tach adapter to the purple Prologger wire. Anybody have this set up that could give me suggestions?
Thanks