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7.Electrical WiringFor the electrical wiring of the new engine, you can attempt to piece together a wiring harness to work with the V-8 motor, or you can go with an aftermarket one. Depending on whether your engine for the swap is carbureted or fuel injected, you may or may not need an engine management computer.It's easier and much cleaner to purchase a new harness from Painless Performance Wiring or Lee's High Tech Trucks. Both of these companies offer complete conversion harnesses, as well as wiring tips and instructions. Having a complete harness made is especially nice, since you can have your harness made to length.