"Thomas Borchert" wrote in message
...

Once something fails, the regulation-mandated back-up kicks in. It doesn't
matter whether that's vacuum, a second battery or whatever else. There's
nothing inherently "better" about steam gauges - except they satisfy
reluctance in the face of progress. We'd still be living on trees if
everybody had that mindset.

We have backup trees in the front yard which we can
climb into if the house becomes uninhabitable for some
reason.