So why a gauge? Why not a 7 segment display or an LCD?
Well, I'm a scraped knuckles, oily fingernails kind of engineer normally. I deal with enormous bits of machinery, so I get a bit excited by old engineering tools and bits of old plant. It probably helps that I have a mild Steampunk obsession too.
As a consequence, I have weird bits of engineering paraphernalia in my flat as decoration. Part of that, is a collection of fairly antique gauges.
So 7 seg displays - boring. Antique volt meter steampunk style - Pretty Freaking Awesome!