Helo identifying Megasquirt things
 

I've been handed back a bunch of different megasquirt stuff I bought from different people a long time ago.
The summary thread got me some of the way there with this stuff, but I was hoping I might get clarification on some of these bits and how to separate them to move on to someone who may find them useful.

This looks like an MSIII:
https://cimg6.ibsrv.net/gimg/www.mia...ed9831e1b0.jpg

I think this is a DIYPNP... board says v.3.0
https://cimg1.ibsrv.net/gimg/www.mia...23d717e22c.jpg

What are these things and should there be one for each of the ECU's?
https://cimg2.ibsrv.net/gimg/www.mia...89a991f8bf.jpg

Which one would this go with?
https://cimg3.ibsrv.net/gimg/www.mia...8084f52bec.jpg

All the things together. Any direction is much appreciated!
https://cimg5.ibsrv.net/gimg/www.mia...df190e1eae.jpg

MS3, MS2 generic build, relay board, 2 JimStims.

Ah Jim stims gotcha.
Thank you muchly Revenant!