Here it is, in all its glory (helps if you know guys who are removing big, old transmitters!).Those are big meters, probably from an old RCA transmitter. Set-reading pots below them, which I should have got as a matched set and ganged so the meter ranges would (mostly) track. Maybe notched pulleys on the shafts and a toothed belt to link them?
Of course, the meter's got to have a pickup element. This one is just razor-cut PC board and a handful of parts inside a homebrew minibox.
Alas, my hamshack is even more chaotic than ever. ...Give me time! (Yes, the Drake W4 Wattmeter is dead, as they so often are).
Speaking of time, it's time for bed!