Fuel Pressure Gauge, 600 PSI Type C-34, F-86A
This is a Fuel Pressure Gauge as used in the US Air Force F-86A North American Sabre jet fighter, measuring fuel pressure to 600 PSI. See photo of the indicator on from the F-86A Flight Manual. Measures 2 in diameter and ~3.5in deep. This indicator is has an overhaul and repair sticker from Naval Air Station NI (North Island, San Diego), perhaps evidence that it was used in the Navy's version, the FJ fighter.