Lets see what everyone prefers

My Speed-O works.
The rest are oem, slow as molasses, reliable as the weather channel, rough indicators of what may, or may not be going on under the hood.
Since my Speed-O is circa 1970Duster, it is mechanical.
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I think the Speed-O is the most important gauge, because without it, Ima thinking the cops wouldda nailed my butt about a million times, and I wouldda had to remortgage the house to stay outta jail. But since it does work, and I watch it like it was my wife's tiney hiney, I have never had a speeding ticket in that car. And so, I have saved enough money to build several spare engines, in case this one should fail.
Touch wood,so far so good,since 1999.
Your results may vary.

Three things I work hard to never bring into my cabin; things that could; hurt my body, hurt my spirit, or hurt my soul.
So; an angry wife; not a chance;and
strange flesh; not a chance; and
hot engine oil; not a chance.

Unless your gauges are in your face, by the time you realize that something is wrong, it's already too late, and the gauges only verify what your brain is already telling you. If I had an oil-pressure gauge, I'd likely be watching that instead of the Speed-O, and I'd likely be broke and single living in a cardboard box, for lack of funds due to speeding tickets..