Inline fuel controller, this unit takes the fuel signal and modifies it based on throttle position and RPM inputs. You can use a pre built map table or build your own custom map. Reduced size from PCIII USB (less than half of the size of PCIII) USB powered from computer (9V adapter is no longer needed for programming) Two-position map switching function built in (map switch not included) Gear/speed input (allows for map adjustment based on gear and speed) Analog input (allows user to install any 0-5V sensor and build an adjustment table based on its input such as boost or temperature) With gear-position input connected, the PCV is capable of allowing each cylinder to be mapped individually and for each gear Unit has a -100/+250% fuel change range (up from -100/+100%), which allows more adjustment Ten throttle position columns (up from nine on PCIII USB) Enhanced "accel pump" utility (increased adjustment and sensitivity ranges)