Oil Pressure Gauge Set, Dual Engine, for 4 Engine Aircraft, US Gauge Type B-9C
This is a pair of 1940-50's vintage dual engine Oil Pressure Gages, type B-9C (formerly AN5772-2) and made by US Gauge., labeled for engines #1 & #2 and 3 and #4. Likely used in late WW2 or post WW2 4 engine aircraft such as B-29, B-50, C-54 etc. Do your own research to confirm.
The instruments are in very nice condition for their age. The dial markings are clear and the glass and cases are intact. Both have been painted on the outside glass with the operating limits of the aircraft in which they were installed, see photos. The #4 pointer appears to be loose but might be able to be re-inserted firmly. The glass for #1-2 needs cleaning from the inside, which is usually simple to do, but I'm leaving that to the buyer. Would be a great addition to your collection.