Cockpit Instrument Respectfully Retasked as a Clock

How do you convert an old cockpit instrument into a clock? Easy: just build a circuit that convinces it it’s in the air, and the rest will take care of itself.


This is a companion discussion topic for the original entry at https://hackaday.com/2023/12/05/cockpit-instrument-respectfully-retasked-as-a-clock/