any ideas how to read reversing and turn signals?

[pointy030485]

Hi there
I use the obd to i2c adapter with arduino to read the speed and rpm form the car.
But I also want to know when the cars gearbox in reverse gear and when the drivers enables the turn signals...

I'm totally noob in all this..
But are there any PIDS for that, and where and how I use them...

Thank you very much
p.s. sorry for bad english (not my native language)