Hi men, I am putting my block together and there is a switch of some type attached to the crank housing behind the harmonic balancer. My old engine did not have such an item. My block is a 1987 Mercruiser 350, 270 hp. This switch appears to be the female end with two or three prongs inside and hangs there toward the bilge floor. Any ideas and what do I do with it? Thank you, Bob