the SD Has about the same number of turns of wire as some of the hot PAF style humbuckers .about 6000 turns or slightly less . but wound with 44 gauge wire makes it a great medium output with good clarity for rock tones ,
Maybe here on the stew mac site. says 9k
I did have one in one of the shop les paul which is a 2016 studio ,we removed it . I did take some readings , it was over 13k & Alnico 5 magnet . I thought it was a pickup better oriented for rock & heavy tones as it had a very sharp top end .
80% of all my personal floyd rose equipped & F spaced guitars with a Fender style trem do not use or need a F-spaced pickup ..it's not necessary as there is no low/dead notes, when using the Gibson spaced 49.2mm or import 50mm . these will work fine . any Fender Strat will have 3 F spaced...
I have one of the clear bobbin p-90 pickups in one of my guitars (it even has a part of the flange of the bobbin broke like in one of the previous pics ) it does read a whopping 8.8k but it sounds good .