Racetronic ECU question

The car I'm building has a Racetronic ECU. I have all the cabling to the injectors. What I dont have is the connector on the other side of the box in the picture. I assume it's no more than power and ground. Sourcing the plug itself is not a problem. What I need to find is if anyone knows which pin is positive and which is negative. If need be I guess I could take it apart and see if that tells me but figure I'd ask first.
Second question, on the side are small "A" and "B" adjustment screws. I'm guessing mixture and ? Can anybody confirm?

I could get the side cover off and can see the top 2 terminals are indeed power and ground. The other 2 terminals have 1 small wire each on them. Maybe a tach/rpm signal for one of them?
Somebody must have a wiring diagram for these things or a suggestion on who to ask?

Hope this helps

It helps greatly sir. Much appreciated. I've sent you a PM.
Thanks
Jim

Hello Jim
This is all that I have
Russ

Thanks so much. 100% more info than I had 2 days ago. I appreciate the help sir.

Still trying to figure out how to trigger this unit from the Bosch ign system. Could it be as simple as using the negative on the coil as a trigger?