Why the fuck do cars still have analog speedometers? Surely digital ones would be more accurate and much easier to read without looking away from the road for too long.

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You're absolutely right that well designed analog guages are glancable. But that only really matters if you're racing. If the difference between glancing for 0.4 seconds and 0.5 seconds matters, then you're driving too aggressively for a public road.

I personally prefer the digital speedo. I find a sense of comfort in the perceived accuracy. I find it easier to read than analog guages on most commuter cars, where the needle is pointed in some random direction for most speed limits, the numbers are small and dense, with lots of markers. With a digital speedo I can glance down to my big ol' high contrast display and be like "speed starts with a 5, good enough"

I'm not looking at the speedo to get a trend, I can hear the engine or feel the acceleration in my body for that.

For other guages: Tachometer: is dying off, but really all you need is a shift light if you're even driving a manual. Gas: the amount in your tank doesn't matter, it's your range that matters, and a digital display for range makes sense because it lets you plan your trip. Oil/coolant temps: hot/normal/cold lights are probably all you need. Even then you really only need to show it when it's not normal (which is something a digit dash can do). Boost: for daily commuters (where turbos are actually pretty common now) just a light to show if boost is too high. For performance cars, this is pretty much the only time I can see an analog guage really being better, but even then there are other less common but equally effective ways to display this kind of low-precision wide-range information.

Of course, if you're talking about style and aesthetics, then both digital and analog have their place, depending on the aesthetic you're going for.