In this setup, the each pin is exchanged. One will be shut when the oil pressure is low, the other open. At the point when the oil pressure raises each will change state. A 3 pin switch typically has two pins that switch state, one that is ordinarily open, one that is regularly shut and a typical association, normally utilized for ground. Source: http://techprotools.ca/index.php?main_page=product_info&cPath=5&products_id=1021
 

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