OBD reader shield

I’m going to use this shield to get some data off my car. It’s a VW Golf mk5 GTI with a DSG gear box.
http://www.skpang.co.uk/catalog/arduino-canbus-shield-with-usd-card-holder-p-706.html

One of the staff I need to get is the gear indicator, while in manual mode.

I’ve got this to get the data from the ECU:
VCDS Address 02
Measuring block-08
Group 002 filed 4

However I don’t have the formula to use with the above shield. Can this be converted to a formula or used somehow else at all?

Thanks.

What code do you allready have? Can you post it?

Do you have the datasheets of the IC's used?

I've used this to perform some tests and managed to get some data:

http://skpang.googlecode.com/files/joystick.zip