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Alot of people on here don't rate the fse regulator for turbo use as apparently it's not very accurate at holding the set base pressure above the boost pressure. I was persuaded to buy an aeromotive one instead.
You will need a rail adaptor, like the one in the above link. Chances are, you'll need a new engine too fitting an FSE reg. Get yourself a decent one, not worth risking it.
£415!!! Fuel Lab are very good regs, sounds like something your garage did wrong, are they paying for the repair? What reason did they give you for going pop?