Transmission wiring connectors
 

I'd appreciate some assistance in understanding this harness from a '86 560SEL:
http://www.carcentric.com/speedoharness.jpg

Specifically:
1) What does B (a single female bullet) connect to?
2) What is each of the 4 pins in C for?
3) What is each of the 7 pins in E for?
4) Is the light (F) an indicator of some condition, or just for illumination?
5) What do the square sided and round sided (2 female bullets) in G connect to?

Also, if A is not the Hall effect sensor, and D is not the accelerator pedal kickdown switch, please correct me.

Thanks!

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.

This is the back side of the speedo I'll be using - from a late 380SL:
http://www.carcentric.com/380SL83clusterR.jpg

Its inputs (the rectangular connector) are G for signal, 15 for 12v+ (switched), and 31 for ground. The large round connector is an output to the cruise control, I'm told.

I thought the speed signal would start from connector A in the first photo, then come into the cabin at the grommet, then out some pin on E before going to the rectangular connector on the back of the speedo. Benzmac, does "G goes to the rear of the cluster for the speed sensor pickup to the speedo" mean that either the square or round side of the connector I've labeled G goes to the partial harness in the speedo photo in this post?

I'm not familiar with Hall effect sensors - is my assumption correct that there will be continuity between the center contact of A and whatever it's output pin is?