Quote:
Originally Posted by Porsche-O-Phile
Typically used on piston twins. Yes, looks quite old.
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Yep, looks like a dual CHT for an older/vintage piston twin (DC-3, etc.).
Or, could be from an older 4-engine piston as well (B-29, etc.), where there would be two gauges.
Typically there would be a placard attached to the top mount screws to designate which bank (and the individual engines) each gauge/needle corresponded to.