harman sells the oil burner option for $639.00 (price from may-08)
you get a modified door, switch box, fuel flex line, oil gun,fireproof fiberboard(install in hole opposite the gun)
you may also need a new label on the boiler that says it is qualified for oil or coal.
if you are very handy you probly can build everything but the label on your own.
it will take alot more time than it is worth(in My opinion)
there are 2 micro switches on the new door that stop the gun from firing if the nozzle cover plate is on or the door is open.
this set up and alignment would be very difficult to make on your own(but not impossible.
here is the label on my VF3000:
here is a link to another post with alot of pictures of the oil gun optionhttp://nepacrossroads.com/post54110.html#p54110