After some research and wiring digging I found after putting all the info of the donor car together that I probably have the rear part and wiring from an -85 turbo look car (I was told that it was an -83).
So with the right wiring diagram everything was a lot easier… All the colours in the rear connections to the engine is connected and every colour matched from the beginning. I also found the connections for the three cables in the front so no need to cut any cables

I also started connecting all the gauges and I think that I got 99% of the functions to work, the last check would be when I start the engine.
Thanks for the wiring help so far!