Personally I love driving with a stick shift when I get the occasion, but with the endless stop-and-go of our traffic jammed roads I find the automatic has its benefits too.

It’s useful if you know how to use it. You however clearly don’t know how to use one.

You do know, of course, that an automatic transmission-equipped vehicle gets worse fuel economy than a manual transmission, right? While cruising at 70mph, an automatic trans will run the engine several hundred RPM higher than a manual trans… something that useless tach would indicate.
An auto trans also has many more moving parts, which cause parasitic drag through the driveline, also affecting fuel economy.
They’re also heavier than their manual counterparts, requiring more gas to haul down the road.
But let’s talk about “wasted energy to produce.” Lots more pieces in an auto trans, and a lot more machining with big, mean 3-phase industrial machines that suck down so much more power than it takes to build a tach.
Oh, an auto trans also requires a bigger radiator than a manual–more aluminum. Sometimes they even have their OWN cooling radiator. They certainly require a bigger cooling fan, which uses more electricity, which requires a bigger alternator.
And it is filled with several more quarts of that nasty old petroleum than a manual trans.

So stop being an idiot and acting holier-than-thou about a tach wasting energy to build, while you’re wasting far more energy because you’re too lazy to shift your own gears, or too incompetent to do it.