Space Shuttle Auxiliary Power Unit (APU) Pressure and Temperature Indicator as removed from a high fidelity Space Shuttle simulator.
The APU’s provide hydraulic pressure for control of aerodynamic surfaces.
Although a critical part of countless flight simulations, the unit was no longer needed after the Space Shuttle avionics were upgraded to
a “glass cockpit” design (see NASA fact sheet pdf for more about the MEDS upgrade).
Retired from space program service in April 2009.
Image of the inside of the unit reveals the display tape drive mechanisms and circuits, which move the needles along the gauge scales.
