Realistically do you look at instruments more than the road to notice ? I'd sooner keep an eye on the cages around me than maybe know Iv a puncture,having spent the past 24 years without this I can't be arsed either
From experience, you notice the warning light on the dash through peripheral vision - you don't need to be looking at the clocks to notice it when it comes on. I managed for 30+ years without them, but if you read what people are saying in this thread, they're not essential but can make life much easier in some situations.
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