Here is the image that you need. Good visual but it is related to small engines and carb equipped applications.
http://www.tuningmatters.com/how-tos...retor-setting/

Here is more detailed info on plug reading.

https://www.ngksparkplugs.com/about-...d-a-spark-plug

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2005 X5 4.8IS
The Blue ones are always FASTER....

Current Garage:
2005 X5 4.8is
2002 M5 TiSilver
2003 525iT
1998 528i
Former Garage Stable Highlights
2004 325XiT Sport
1973 De Tomaso Pantera, L Model
1970 Dodge Challenger T/A 4 sp Alpine White
1970 Dodge Challenger T/A 4 sp GoManGo Green
1971 Dart Sport, “Dart Light” package
1969 Road Runner 383
1968 Ply Barracuda 340S FB Sea-foam Green