From americanlemans.com:
Today's ALMS car steering wheel is used for far more than to just turn the car. It is the complete control center for the driver for the display of important information and the switching of vital car performance functions.
1 Rev limiter lights
2 Gear indicator
3 Dash display for times, revs, warnings, etc
4 Lights flasher for warning slower cars
5 Pit lane speed limiter
6 Ignition map control for changing engine characteristics
7 Page switch for switching between different information on the dash display
8 Emergency switch for resetting the car electronics
9 Fuel meter reset button; 10. Fuel injection map switch
10 Fuel injection map switch;
11 Gear paddles for changing gear
12 Drink button for automatic drink pump
13 Engine start button
14 Neutral button for gearbox
15 Reverse button for gearbox.