From a Spitfire or Seafire crash site

[Matteo La Boccia]

Any idea about it?? Thanks

 

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[QUICKSILVER (appletree)]

I looked at a number of

Rolls-Royce Merlin​

Spitfire airplane engines at several angles and exploded diagrams and I come up with this tag under the prop shaft in front and below the supercharger, possibly to do with the fuel pump

 

[Rmeav8r]

A good bet would be the data plate off of the Tach Generator. It sends the prop rpm to the cockpit RPM gauge.

These are still used on modern turboprops today.