Need some wiring help

[Iceburgh]

This is my first LS swap and I am not 100% sure what is going on but I am getting closer.
First my background. I have built 7-8 trucks/street rods. Not much I cant or haven't done but as mentioned this is my 1st LS engine. The reason it is my first is due to lack of understanding of the electrical system hat runs everything.
I have a rebuilt LS1 with a rebuilt tranny along with a new computer that has been flashed for this motor knowing it was going in a street rod.
The person that sold it to me had it running with a video that he sent.


My questions are a few about some of the wiring. Most connections I can figure out by process of elimination. But not all . Can some of you guys help me understand where someof these go to or from.

1st the reader.... I know what it does but can you tell me where it wires to.
looks like 4 prongs are used


1 orange 2 black and 1 green wire


Next are 7 thin wires that come from the main harness that has all other plug in connectors.
they are Dark Green, Light Green, White, Grey, Brown, Light Blue, and Purple



Next is this obvioulsy plugs to something but not sure where or what




And Last the fuse box
1 Blue wire, 1 Pink or light red, 1 Heavy guage red ( I am assuming to battery positie) 1 red light guage ( I am assuming a switched hot ) 1 black, 1 yellow and 1 plug. Not sure on any of these.


Thanks in advance for any help.