[Red Mustang Gt 46]

As you look at the engine from the front, look at the intake plenum (the cast aluminum piece with the Cobra in the middle of it) and on the right side you will see a silver cylindrical piece with a black plastic end on it, there will be a clip with wires that connect to a harness. It is near the front of the plenum and is about the size of a "C" cell battery...