240sx maf wiring, I though I had it now I'm confused.

[Patarach]

Ok well Ive been searching for awhile on how to wire up my n60 maf and Ive pretty much figured out that its the same as the n62, The problem I'm having is that it says that the black wire coming from the KA's harness is a ground but when I put my mulitmeter to it and the chassis I get no continuity. Now after an hour or two of searching coming to this has Kind of thrown me off. Any help would be appreciated. Thanks!