magnetic sensor - Denso
Here is a cell phone pic of a Denso.
In this picture, see the green assembly on the left. In the center there is a square opening. There are a pair of magnets embedded in the square. Look at the assembly on the right. The silver round part in the middle is the sensor. As the pedal is pressed the magnets rotate around the sensor. It is a bit off-set so that the magnetic field can increase on the sensor as the pedal is pushed.
I have noted the magnets appear to be stronger in the Denso.
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