Realistically, I'm looking to keep the tach, temp and OP gauges, but actually putting them OUT of my line of vision. They have value upon warm-up, but last year on my backup run, a combination of a rough spot in the track and spending too much time staring at the tach caused me to short shift a bit on the 3-4. Had I had my eyes up and an idiot light indicating the shift point, it's likely I would have been better prepared to drive through the rough spot while staying on the throttle than freaking out and shifting.
And let's face it, a sudden drop in OP at 8K is better handled with a cutoff switch and an idiot light than by human reaction.