uhm i think that... you are simply calibrating the tachometer... to turn up the idle you have to pysically with a screwdrive raise the idle screw. it should be on the IP be carefull though. it will snap off if your not gentle

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Have you ever noticed that anybody driving slower than you is an idiot, and anyone going faster than you is a maniac?

As long as they would add one additional commandment for you to keep thy religion to thyself.
George Carlin (Wonder where he is now..)

1981 240d (engine donor 1983 240d) recently rebuilt engine hurray! - No more.. fought a tree and the tree won.

pearl black 1983 240d 4speed (Converted!@$$%) atleast the tranny was rebuilt.