An electrical connector includes a housing having a cavity. A wafer stack is received in the cavity. The wafer stack includes a plurality of electrical wafers arranged parallel to each other within the cavity. Each wafer includes a first edge and a second edge. Each wafer includes at least one trace between the first and second edges. The electrical connector includes a flex harness including a plurality of flexible printed circuit boards (FPCBs). The FPCBs are electrically connected to corresponding wafers.