nice work,

the hall effect switch is present in cruise control cars and also was used to lock the outside temperature display in later models. So it would not read the hot exhaust from the car infront of you in a traffic jam.

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2012 BMW X5 (Beef + Granite suspension model)

1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)