Actually the voltage goes up to 5 volts before it is considered pegged and you need a bigger MAF. Knowing the voltage can come in handy if you can map TPS,MAF, AF Ratio on a sheet for tuning purposes. If you have a supercharger it would be really good to know that your not pegging the MAF because after the signal forces the computer to use a preset table and bypass the MAF sensor.John Luttrell said:Would be difficult to do; it sends out a signal in milivolts. I would be afraid to tap into the MAF sensor wires do to the fact that any voltage drop would cause a drastic change in signal to the computer and effect drivability. Why are you wanting to know the readings?