EDIT: Said, I see the rules were changed on the 12th of March... no loophole there any more. I'll see if I kept the last set...
Nope, I'll keep looking... but if you look at the rules on the FIA site (
link) the last-modified sections are highlighted. The point IRBR are quibbling over is that the previous version didn't mandate the FIA sensor as the primary sensor. It was obvious to
presume that it should be but it wasn't stated until the Directive. They're normally considered regulatory but aren't
actually regulatory, or so say IRBR, the shifty buggers.