Rochester Manufacturing Co Inc: Oil Pressure Transmitter/Sender. Found under the Coughtrie BD, next to the Circuit Bay doorway. The one pictured was made and shipped around 1943 and returned as surplus to stores in Wales in 1947.
There is something a little odd (if not slightly disturbing) about the one used in the Falcon here. Where the rubber hose is attached to the unit, the unit’s tube-like intake part looks squashed – with a line or a crack down the centre. This part is approximately 3mm to 4mm thick aluminium, which makes me think the MF piece maybe from a crashed aircraft.
The sensor/dial looking part, I think, is made larger and sits on top of the origional part and is made from a softer material such as plastic or even a leather. Reason being that the object is at head height, all sticky outy and origionally 1mm thick metal, which would definitely cut even on the softest collision with it – also, the edges are slightly curled upwards which couldn’t happen with this type of metal.