> Another option would be a colored plasic sheet with 7 segments
> masked off, lit by brake lamps under PIC control with MOSFET
> drivers.  No moving parts, which I like better

Filament bulbs ? Not fussy about those unless you run them under-
voltage to extend lifetime. "grain of wheat" neons perhaps behind
a diffuser

What I really objected to with LEDs was all that soldering. It took
me the best part of half a day to solder up a 7 x 64 and I reckon
you'd be looking at 30 hours (at what cost ?) to make a large
7-seg display. Imagine the tedium - LED after LED after LED....

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