This kit allows for both a vehicle speed sensor or driveshaft speed sensor that outputs either a hall effect (3 wires with power) or inductive pick-up style (2 wires) signal. The harness can be built to suit either signal style, but hall effect will require 12 volts to be supplied from a separate power source. Connector Kits Consist Of Connectors, Terminals & Seals Only ? No Wires; Adapts Xfi to IPU and Hall-Effect speed sensors.