I just purchased a techrods harness two weeks ago and I must say I am very pleased with the quality. It comes with a datalink connector, a tach wire, a fuel pump wire, a fuel pump relay and fuse block all for that price. Also the harness is 5 feet longer to the PCM so you can mount it where ever you want. I even sent them a note and had them make my harness with LS1 car type injector connectors, since I am using a Camaro intake and injectors.
Some people might have qualms due to the price, but I work for a diesel engine manufacturer solving issues with wiring, sensors and such and this techrods harness is every bit as good as one of our factory produced engine harness.
Later,
Jason