strange plug/fitting????.....

[rbforsale]

thes a strange plug thing of some kind on the right side of the block,yellow in color and nothing hooked into it?i had the engine put in buy someone else so i have no clue,its right under the intake manifold...

[sinnerstar]

Oil Pressure sender??

[Coolwhip]

a picture of some sort would help

[USMCgetsome]

knock sensor or oil pressure sender.

[Carl H]

if its 2 pin then its the oil pressure sender.