Help identifying

And i thought I was daft, wanting to fit a Walter rocket motor to my mobility scooter !!!

Aha! So that's how you managed to get round DX so damn quickly!
 
I had an identical Stewart-Warner vacuum gauge on my '68 Chevelle (Hilborn Fuel Injected 502c.i.d. V-8), it's defiantly automotive.

However, that gauge would not care what it's measuring (or what type of engine it's attached to), so it is most likely that it was used as a diagnostic tool.
 

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