Absolutely. I have one on my SG (and about 5 other pieces of equipment). It's great when you have a new wheel and want to spin-up slowly before it scares the pants off you when 1500lbs of SG starts shaking. (That problem has all but gone away since I started making hubs with a built-in balancing mechanism).
BTW: If you get a SG, do your life a favor and get a dust collector... BTW, Matt at Precision Matthews has a nice SG. It's the same one Enco sells for something like 3 grand and his is a lot cheaper. Of course, they're available used but, just as much goes wrong with these as with lathes so, some re-work may be needed. Usually scraping (or bed bearings) and motor bearings. I got lucky with mine, it was re-scraped and all new bed gears installed. It does need an intermediate coupling that connects the motor shaft to the spindle but, it's not life or death yet.
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Ray