OBD? dash

Now I'm homebound :sad0147:, i got the idea to build an new dash.
In my workshop i do have an bendable LCD (shockproof) what will fit nicely in the old dash.
so I'm occupied by writing and rewriting software, based on the OBD elm-scan-software.
At this point I'm a bit stuck, on how to implant this on the ecu of my rig.
I time ago, i did ask on the forum, about the two yellow connectors just in front (a bit below) of the cooling liquid expansion tank.
I got as an answer that those connectors are a kind of pre OBD 1/2, and called BRDII i believe.

I would like to use the output info from those connectors in to my new dash.
But before inventing the wheel again, i will hope that some of you will know the pin-out of those two connectors.
It will save me a lot of (investigation)time.
:coffee:

while i was waiting on my oil pan to be ready, I've been messing around with te wiring.
In my diagrams, i find an relay named "B- latched"
on one site it is connected to the ECU (B10) and on the other site it ends up in the diagnose connector D2.

what is the use of this relay ???