Repurposing a dead pressure gauge
Okay, so it's not quite as radical as rebuilding battery packs with hand-crafted foil contacts and whatnots. But I had a jolly time turning a dead bourdon gauge into something useful.
I won't go into the details too much, suffice to say, if like I, you used a radio time-service clock module, you'll want to put the ferrite core of the clock module *outside* the metal case of the gauge. I embedded mine in the rear face of the wooden mounting panel.