What is this wire connector at back of engine (X305 MY95)

I am looking at the back edge of the V12 motor in the 1995 XJ12 I recently acquired and I see this connector just hanging loose just above where the oil pressure sender is located.

I thought at first it was a connector for an O2 sensor but the connectors for the forward O2 sensors are located just outside and below the back edge of the intake plenums.

Any ideas?

I cannot say definitely about the X300, but my X350 has a couple of female plugs just like that just hanging loose and I discovered that they were for connecting test instruments at the factory.

a little similar to exhaust oxygen sensors conenctors ?