I stumbled upon this useful explanation of VWs Digifant system (applicable to 86-91 Vanagons)

Most of the information applies to us, although there are some minor errors in his write-up when pertaining to Vanagons.

http://www.members.tripod.com/~fuelie/intro.htm

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Interesting how he is a fan of Stabilant 22, a "dielectric grease" for electrical connections.

http://www.stabilant.com/appnt20h.htm