I want to run the Greddy E-Manage over the VAFC. My question is can I just get the unit that retails at $379 or do I need the Injector Harness, Ignition Harness, Greddy Pressure Sensor, and Pressure Sensor Harness? Does the base unit come with the software? Their website is pretty basic. I can get the E-Manage at a lower cost than a VAFC and it looks like it has more usable functions. Please let me know what you guys think. Thanks!!