One more state!
After you power off the car, open and close the door then lock yourself in the driver's seat for about five minutes. This emulates you leaving the car.
Don't move around too much whilst you wait or the motion alarm might go off.
Now, after five minutes open the door or unlock via key fob and you will see all of the needles calibrate at once. They all dance like crazy and move to the negative and then come to rest precisely on to zero.
Kind of cool and you never get to see this state.
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