"I'm guessing the inline resistor you're talking about is 1K as initially there is a dead spot of about 2-3mm before the resistance readings start to change. I guess once fuel pressure is applied, the control column in the fuel distriubutor lifts and the air flow sensor plate drops, putting the plate much nearer to the real zero position."

The plate is designed to allow 'backflow' that would occur with an intake backfire without damage to either the mechanism or the pot.

Steve