I just the engine back in my 1990 300E, and there is one
wire I can't connect.  One end goes to a sensor on top of
the crankshaft pulley, which I have identified as the TDC
sensor.  There doesn't seem to be an empty socket anywhere
to take the other end of this wire.

  The wire has a plug in a half-oval shape with three wires.

  I know it sounds like a stupid question, but anyone know
where this thing goes?

  Thanks.

Kent