watched teh vid, and that looks rather jumpy.
what does it read @ wot if it were propped open and you weren't using your hand (as to rule out an unsteady hand causing the fluctuation).
a power graphing meter would be a better tool to actually see the signal as the dme would see it, in a progressive 'line' of voltage.
all dvoms have a sampling rate, which is slower than a pgm. this is what makes them not such a great candidate for specing a potentiometer such as the afm, or tps, or such.
also, the sensor that you unplugged, was it a coolant temp sensor??