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The ECU calibrates the throttle pedal every time you start the car. That's why it has 6 tracks, there are really 3 different sets of + and - carbon slides. I'm guessing it averages all three of the inputs and it zeros itself on start up within a certain range.

You really can't screw it up, short of breaking the wires off. The only thing you're trying to do is move them forward about a millimeter to get them off the brass backed carbon, and onto the actual resistance sensing part.