Thanks to Rob, Carl , Larry, Ted. The correct # for the electronic E-unit is 40-0105-001 The engine #8376 UP A double wound single motor SD-40 mfg. 1983. My manuals show show both a electronic or a mechanical E units The electronic one i would like to see a wiring diagram since I have 3 in my parts cabinet. And that is an original part. If I install a 100-004 E unit I would have to cut a hole in the frame. The wiring is not a problem.