Luckily this is NOT my project car

Communal policemen (? google translate said so!) here wouldn't allow me to hold the car on public parking for so long. I'm changing flats too often anyway, so I have to keep my cars running. More or less. In a short time I should move to my mother-in-law's house

which will open possibility of building a garage and transforming her back yard into scrapyard.
Unfortunately I can't see most of the images hosted on image hosting sites (job restrictions), so I can't follow your restoration. When I get some time at home I will check it. Good luck with that anyway.
I've found that one of the wires for the instrument cluster in the dashboard is cut. However I have only ph1 electrical scheme where this slot in the connector is not used (2nd place in upper row) so I don't know what is it for. Can anybody help me with that?

Also I cleaned the cabin sensor/fan

And offending tubes:
Ofcourse I can't replace them with something aftermarket because they have different diameter ends. I'll try to repair them.
Also I took out some of the confusing wiring for ph2 stereo. It was connected to original ph1 stereo connectors, so now I have no excess wiring. I just need wiring that connects stereo to display and complete steering wheel controls.