I'm not sure of the 'labels' but 5V for sure. One pin goes to ground and the last goes to MS as the signal. MS has a 5v output pin for this very purpose, so if the MS is wired right there are no changes needed to the TPS end.
Mine ended up being "backwards" (WOT is a low number, etc) but it works fine that way. TS gives you a warning, you hit ok, and go on.