http://home.iae.nl/users/bts/obc.htm
Kai from the German E34 board informed that these are not correct:
1. #06 is not "Amps", it's the measured current fuel in tank (in litres). Works only if ignition is on.
2. #07 is not "% of full", it's the calculated (!!) current fuel in tank.
3. #09 is the current voltage at terminal 15 (not terminal R!), so you have to turn the ignition on.
4. #10 has absolutely nothing to do with something like speedometer correction, it's for the range calibration.