David Gilmour's Money solo is really three solos. The clean, double-tracked opening and the spacious middle run on the Black Strat's bridge pickup through a Dallas Arbiter Fuzz Face and a Binson Echorec for the repeats; the more aggressive third section brings in his humbucker-loaded Bill Lewis Custom. It was tracked at Abbey Road (1973) with Alan Parsons into a Hiwatt DR103 and/or Fender Twin. The 'recorded direct' story is a myth — it was amp-and-mic. Per Bjorn Riis/gilmourish.com, the overdrive method isn't fully logged, so the Fuzz Face attribution is a reconstruction.
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The Comfortably Numb solo tone is one of the most studied in rock history, but most guides get the source wrong. Here's what's actually happening between the Big Muff, the Hiwatt, and Gilmour's technique.