Andrewkd

hello everyone, I'm new to the community and I'm also new to the S chassis and the SR20 engine, got rid of my 03' 350Z because I had the chance to get my hands on a very nice s13 coupe sr20 blacktop swap, as I was checking the engine bay I found that the wiring on the eco was not done right and its a very dangerous harness to run as not only it looks like a rat nest, a lot of the cables are cut and taped together and it just a disaster in general, my question is, do I need to replace the chassis harness or the fuse box harness connects to the chassis harness or ECU? or is it a whole piece, I've never done wiring before so I decided to ask you guys with a lot more experience, thank you