I wouldn't worry about finding a Singer dealer. The wiring is really simple, and just about any reputable local sewing machine shop can handle it.
BTW - You can do the oiling & lubing yourself...DO NOT pay someone to do it!!! It's really really not necessary. I have several vintage machines, and I have not taken even one of them to a shop for "oiling and lubing". It's so simple I taught my 18 year old grandaughter how to do it on her vintage machine!! :-)