N2 gauge as found within the main instrument panel of various classic aircraft. Tristar / B747 / B737 to name some possible uses.
The unit is in good condition including the rear canon plug. This is a real aircraft gauge from the classic era of aviation and includes removal tag. The unit has not been powered and any attempts to do so are at your own risk but the unit would make a great addition to your simulator or it could be a starting point for you own project.