In all darkness there is opportunity. Most all 20Kw and larger gensets these days are either fitted with a electronic speed control or stepper motor. Over the years I stored every Huff belt drive Governor I removed, when changing them to over to electronic. In the preppier world mechanical anything is king. The amount of sets I have removed all electrics from is astounding. The demand for old 2 stroke Detroit's is climing every day, as they are the easiest to convert back to start, run & still have a full self protection system. Voltage regs & rotating rectfiiers can be protected to a point but they are so small they can be caged in quanity. Had one guy out west that just had to have one EMP proof, it took awhile but found and referbed a rocking voltage reg & he was has happy as a pig in shit. The old hydro starters are getting hard to find, but luckly there is a company in the EU that makes spring starters for most everything. Pony engines are coming back as well.