NG harness wiring for ECU

[ben swann]

I am making tedious headway in "Project GTQ" installing NG engine
into '87 4000 CS quattro.  I have mostly completed the task of removing
the CIS-E wiring harness and have routed the CIS-E3 harness from 87.5
GT Coupe through the firewall.

I am trying to identify some of the connectors that go over to the
left/drivers side of the car as well as power source and ground.  There
were similar connectors on the CIS-E harness, but some differences and
not plug and play.

Can anyone identify Power wire and Ground.

Here are the harness connectors d3escription:

1. Red barrel connector has 3 wires -
G/V .5
G   .5
B/R .5

I noticed the corresponding same type of Red Barrel connector was not
used on the CIS harness I removed.

2. Black Square 6 pin connector -
B/Bl 1.5
B    1.0
G/R  2.5
G/B  .75

There was a black round/barrel connector that I disconnected for the
CIS-E harness.  It does not have the same wire/sizes.  Is this a
corresponding connector/Are some of these leads used for CIS-E3?

3. Green round/barrel connector:
Br/B  .5
G/Y   .5

This is similar to the one I pulled out for CIS-E, but wire colors are
different.

Small black with two B/W .5 wires

Separate wires/connector clipped?
G/R  .5
B/W  .5
Br/B  .5

I appreciate any leads on what wires I definately need for power as
well as which if any of the above I need, or the major function
performed by the different connectors above.  Following that any that
may be used for other ancillary functions like trip computer, tach, etc.

Also any suggestions on where/how to tap the power which according to
Bentley is 2.5 R/W and I assume in black square 6 pin connector, but
like to verify.  I assume relaying power from somewhere either off Fuse
panel (hard to get to) or dedicated power wire with relay from ign
(where to tap control wire?).

Anyone have diagram showing the CIS-E3 harness with connectors?
TIA for help.

Ben