I agree. But to be honest. Out of all the times I have been competitively driving, I have never needed to look at the tach. at all. I have looked at it, but only just because. You should be able to tell where your engine is just by the sound. I think that combined with the sequential shift light will make it work just fine.
Also the only thing I have ever really used a tach for is:
Dyno tuning and figuring out what rear end gear size to run, back when I used to race shifter karts.
__________________
|