The Microtech is super easy to install. Because the whole harness is prelabled and you can get a diagramfor S4/S5 setups, you can simply hook the the wiring up based on the diagram and it tell you what factory color hooks to the Microtech harness. So basically, if you can do basic wiring, you can do a Microtech. All ya basically do is cut the old harness off a few inches back from the sensor connector and then splice that connector to the new harness. It took me about 3 hours to install
