Td5 oil connector ???

[justfishing]

Hello,
been looking at RAVE and cannot seem to find the oil pressure connector. I am putting the head back on, and found the connector with a plug and the black wire cut about 200 mm nothing else in the casing lower, must have not seen it when I took it off, I would think it is just a earth ??? anyone ??
Thanks
Ian

[ScotsD2]

It's fine it's just the way it was made the light wire is the important one when triggered by approx 6psi oil pressure the switch breaks a circuit and oil light goes out.