There’s a great deal of info out there on tuning fuel injection systems.  For Digifant II like the 1990 VW’s here’s a good start: http://www.members.tripod.com/~fuelie/intro.htm

  An excellent article from Autospeed.com http://www.autospeed.com/cms/A_2055/article.html on air fuel tuning with vane airflow systems like the Digifant.  It compares O2 sensor tuning with an accurate air fuel meter and wide band O2 sensor.  It covers adjustment of the air vane spring tension and CO setting.

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