We were in the middle of removing the engine from my 1998 Blazer 4x4 Auto. My brother and I were underneath trying to pry the bellhousing away from the engine. The tranny crossmember was removed, so the tranny was free to move around a little. I noticed a small pin type electrical connection fell in front of me, right under the bellhousing. It measured about 3/4 the length of my pinky, had a circular purple colored gasket around it with a very short length of black wire left on it. I examined both the engine and transmission closely and couldn't find any wires sheared off or places it looked like it would plug into. I guess I'm just asking if anyone would know where this particular connection would go. I guess it could be narrowed down to somewhere on the rear of the engine or top of transmission somewhere. Thanks in advance for any responses....

 

Is that from the knock sensor, fom just below the distributor/ oil pressure switch?