Onboard Video of Mazda Pro Series @ Sonoma
 

https://www.dropbox.com/s/x978pn8laf4njqe/Sonoma%20Highlights%20Final.mp4?n=150207577

While there's a lot of passing, the opening minute is the best. ;)

What are the lights above the tach?

Sixto
MB-less

Up shift indicator. When all lights are lit, upshift.

There has to be more info than that. Otherwise why not a single LED?

Sixto
MB-less

The guys were certainly giving him room to pass. Fun stuff!

It allows altering shift points for changing conditions among other things. Example, in the recent Singapore F1 Grand Prix a driver was experiencing major electrical problems which caused his pit lane speed limiter to not work, so engineering told him to keep it below the red lights in first gear instead. Other times they may be told to shift in the yellow, etc.

Multiple lights let you know when you're getting close to the shift points within the set RPM range, not just when to shift (when they're all lit up). It's easy to see within the drivers peripheral vision.