The last two piccies are very familiar terrain for me.
These are the VMVK cables, Vynil, Mantel =(casing) Vynil Kabel = (cable).
These are made in three, four and five core, with the actual cores in a filler material which peels away easily. The outer grey casing is quite tough and can be used with no problems in temperatures below zero.
If the cables is saddled to the wall (brick) a 5 mm² hole with rawl plug was made, The bottom part of the cable clip attached, then cable in slot and top part attached by means of two plastic screws.
Porshe made good tractors other than fast cars,
Has a very similar look as the older Deutz tractors which also had an air cooled diesel engine.
I like the photo's Rollie