Well I order a new Casper engine harness a year ago when I was starting this project. The old harness worked but I had a bad case of whileimatititis and there was a Harness sale. John Spina really works with you to make one to meet your needs and there are a few options I chose. I wanted to hide my harness under the intake instead of along the valve cover so he lengthened the appropriate wires. I chose the positive fuseable link as well as the negative ground adapter. I opted for the extended battery harness kit as well. That ahold make connecting to the positive fuseable links easier as well as some slack to the starter. The powermaster wiring was removed as well as the egr and waste gate wires. The delay relay was eliminated and the alt field was prewired to eliminate the dash bulb from causing charging issues. The alt power cable was integrated so I don't have to run a wire under the block like stock. If you order on make sure you've figured out how your setup will be first.