Here's an interesting video tidbit from Smart Design, describing a portion of their development process for the Ford SmartGauge, an LCD based instrument panel for their hybrid cars. Concerned that an LCD screen would increase visual demand, Smart designers utilized the LCD's capabilities to reduce glance time, using areas of color to display information that could be seen in a driver's peripheral vision. Dan Formosa demonstrates above.
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Interestingly, they didn't touch the speedometer witch is by far the most used gauge, though probably a choice of Ford. Having a gauge that had a hue gradient with speed would be great, green for [100-110km/h], yellow for [110-120km/h] or what ever.
To me there wasn't a big difference in readability. I couldn't see the red mark on the left one and the right one was a blur. I did it again and somehow the red bar stood out for me. Though I'm left eye dominant.
As for colour:
how about those yellow "drain" bars transforming into red or orange as they near the critical zone, with the contrast increasing as the urgency increases? (An intuitively recognizable gradient rather than an absolute)
A quantifiable gage (faint, precise lines with numbers), superimposed, could satisfy the car enthusiast/engineer driver, who wants a quotable number attached to that urgency.
I would hope that the proposed solution is user-configurable, to accommodate different users.