all my wiring is all screwed up like my fuel pump doesnt run and i have a few other things rigged

i want to get like a whole new wiring harness but where can i get this?

i have an 88 mustang lx convertible

you could try a painless wiring kit, which summit sells. you could try finding a complete vehicle wiring harness in a salvage yard, or you could try repairing what is not working properly.

thanks