I'd suggest having pipe-organ and electric-organ, the latter encompassing Hammonds, Farfisas, Vox etc. as well as questions about Leslie cabinets. The current organ should be removed, the currently 75 questions re-tagged with either of the special ones.
Pipe organs are very different from electric ones in playing technique, sound and associated musical genres, so I definitely don't fint it good to just throw them together. Probably most electric-organ questions will be about Hammonds, and the other ones don't really warrant a tag of themselves.
Arguably, the Leslie cab is an effect in its own right that can be used also with non-organ instruments, but it's so strongly associated with the Hammond that it's not worthwhile to have an own leslie tag.
Not sure about reed organs. They probably don't warrant an own tag either, although there are again significant differences in playing technique. It probably ok to just classify these as pipe-organ (after all pipe organs generally have reed registers), or perhaps it should be rather acoustic-organ or wind-organ? Alternatively, keep it pipe-organ plus add harmonium.
If a question really is applicable to both pipe organs and electric ones, it can have both tags, or more likely it should simply be tagged keyboard.