thanks everybody for the information.
@ kmead : I do agree that the original wiring and parts are good. However on the75+ cars there is a lot of wiring considering the anti-pollution things.
On my 1978 car there is a lot of -now- useless wiring & parts ( ao passengerside ).
I have my black spider ( "Bianca"

), already 15 years and the only electrical issue that i had was a fire due to a wire placed by the pervious owner ( it's always their fault ) : extra wire to rear fog light with no fuse whatsoever !
I placed relais (4) , extra wires and fuses for all the lights 14 years and 9 months ago ( after the fire) and things are working fine, but i need some space central in the dashboard ( to place a Halda tripmaster) and need to eliminate the reostat and replace the wiperspeedselector. As 2 of those relais are in the motorcompartiment, along with the extra fuses, and the original fusebox is not in great shape, and I would like to get rid of the extra wiring about those antipollution things, I was considering rewiring ( not 'rewiring'

)
groeten, Geert.