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Per the manual for a 2 valve per cyl. Norge, the dash is where you can read the error codes. It will show the ECU and the dash. The dash is where the OP codes are kept. If there is an X in the left check box, it's a current issue, if it's in the right box, it's stored in memory IIRR. If do a search for DSB 07, you should be able to find a pic of the dash showing the error codes.
Not super positive, because I have an 8V Norge, but that is the ABS connector. THe GD is up higher at the small fuse box near the seat latch, and the plastic tool bag carrier cover thinggy.
So what was wrong with just removing the negative lead from the battery, and feeding the current through a small globe to test for a parasitic drain ?Then if the drain exists, disconnect the suspect sensor and see if the light goes out ?Would that not tell you whether the sensor was/is the culprit ?