Opinion on universal wiring harness

Thanks for all the links! Ill be doing some studying tonight but i really appreciate all the input. Ive done some electrical in the past and im no expert but ive got soldering experience and a good multimeter so hopefully thats enough lol.
It's really not. Most terminals are F type open barrel crimps and very little soldering, if any is needed. A typical multimeter's resistance measurements will only show really bad connections, but miss poor ones that will show up under load. If you can setup appropriate loads, you could use it to test for voltage drops.