A stacked electrical connector has an insulative housing, a plurality of signal contacts and a pair of contacts retained in the housing. The heat generating elements on the face side have fitting elements projecting beyond the heating block, and fitting element receptacles assigned to these fitting elements are formed on the housing. The method comprises proving a respective fuel delivery assembly for each cylinder. The wiring includes a plurality of lines passing through all the plurality of layer portions. The second process is different from the first process.