Basically the MAF takes the +12 volt wire coming in, and the ground wire coming in, and varies the resistance between the two depending on how much air is flowing and sending that on the ouput wire. So resistance means everything. What the guy here is trying to do is put a resistor on the +12 wire and connecting it to the signal wire to make it read somewhere less than +5 volts. The only problem is like you said, the voltage should vary from 0 to +5 or so.
1991 240SX SE 5 Speed Removed mechanical fan, removed intake silencer, bumped timing.
1995 Camaro Z28 Auto Under Construction.