Electrical solderless or soldered connectors

Maybe I should have explained, I rewired the car. Using single wires, no wire looms. I have what looks like a rats nest behind the instrument cluster. But I am able to follow each individual wire from one end to the other, this way finding the problem with the terminators/solderless connector.
I bought this car 10 years ago, because my very first car was a 71 Duster. I bought the car to work on, to give me something to do (which I find pleasurable) I rarely take it to any events.
This last year, due to physical conditions, I did not drive or work on the car. I have started up again.
I have been told because I wired the car, as I have, no one will buy it. Which is ok with me, as I have sons-in-laws that both want it as is.

I have schematics that I modified to show my changes from the original and many 'as built' schematics that I drew up showing additions of my own
designs.
Although, since I started this thread, I bought a couple boxes of connectors and started experimented in different ways to crimp. some better some worse