By the way....Our Texas driving handbooks and the Chevrolet Operating manuals often had a section devoted to scanning the instruments about every 5 minutes as I temember it, You did a quick eyeball scan "right to left and a down and around"!
We did have crowded roads but it seems to me drivers were more calm and collected, and drove without rage.
I think that the first new car I had with "Idiot lights" on the "generator and the oil pressure warning" was around 1957. I quickly added aftermarket analog gauges, since the "Idiot Lights" only indicated zero oil pressure and zero charging, no indication of change from normal.