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Well, they may not be essential, but I found a shift light very helpfull. In my Formula Ford I use it as cheap data acquisition, if I see the light 10 feet sooner exiting a turn, I know that my exit speed has improved. I set the light at my desired shift point, not red-line. A single shift light doesn't cause jerky actions at all, you can even set it low, and shift a second or so after seeing the light.
True, there may not be much need in a non-competitive event, just shift a few hundred RPM sooner. Having said that, if it increases your enjoyment, go for it!
Steve
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