I've wired my sensors exactly like this:
And now you are talking about cabling, which is just as well, as that could be the problem - bad cables and bad connections. The 127 suggests sensor not connected but I guess it could also mean "connected but unreadable".
You might be better off proving the point with the breadboard setup you alluded to.
Having said that, I got caught short with my local installation and chanced using 1.2m of cheapo four-conductor I had to hand. I think it worked, but luck, the short length, and an electrically-quiet suburban environment probably had lot to do with it.