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I've seen videos of tapping and using the reverse switch for the instant direction change.  Is it pretty well accepted that this isn't harmful to the brushless motor?  I would only ever do this at low RPMs.
Has anyone been doing this for any length of time with no ill effects?
thanks.

Hi, I do a lot of arduino projects/tinkering, and would like to build this little tachometer from scratch.  I see your original code that you first tested it out with on a 16X2 LCD & an Arduino UNO.  Do you have the code you use for the 7 segment kit?  I'm not sure which way I'll go yet, I've worked with 16X2 LCD's a lot, but never the 7 segment type. 
One perk I see for the 7 segment display is it looks like it might be clearer to read.
I thought about using a tiny 8X2 LCD character display, and then I could have one of the two lines display either "FORWARD" or "REVERSE", to indicate the spindle direction. I think an 8X2 would fit inside the existing box in the same location.

ps.  OLEDs are supposed to be very clear to read:  I see CrystalFontz has this one that is almost identical in dimensions to your V2 board, so it would fit nicely inside the enclosure.

https://www.crystalfontz.com/product/cfal5016ay-module-50x16-graphic-oled-display