Typ 89 Oil press sender

[tihol tiholov]

Haudi all, have 2 questions:
1. What is the piece that threads into the front bottom of the NG engine with a spring inside it and a single wire screwed on its top?  I thought it was the oil pressure sender for the check system (the red blinking oil symbol light), yet I was sold a piece with much smaller thread and a spade for the wire by a very reliable parts supplier.
2. Is the oil pressure sender for the warning light just below the other oil pressure sender for the gauge with the 2 wires?

TIA,
Tihol  


TT