1. goes to the 1st gear switch on the rear of the tranny.
2. 2 pins for start lock out when not in N or P.
2 pins for reverse lights

G goes to the rear of the cluster for the speed sensor pickup to the speedo.

Yes, A is the speed sensor.

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Benzmac:
Donnie Drummonds
ASE CERTIFIED MASTER AUTO TECHNICIAN
MERCEDES SPECIALIST 11 YRS