Capri Firewall Holes

[Aether]

This should be an easy one for the experts. I have been working on my Capri and most of the services have gone through the firewall. I think I only still need to pass through:

1. Speedo
2. Main wiring loom

The problem is I have no idea what goes where and there's certainly more than two holes left in the firewall. Can anyone shed some light on what these holes are for?

I want to start wiring up the car but I can't until I am 100% sure where the main loom goes.

Any help much appreciated!

A. ??
B. ??
C. ??
D. Speedo??
E. (Beside steering column) - Main wiring loom?