Legality of using a pressure sensor on the high pressure circuit?

[Joe Ross]

That same rule has been in the rules since at least 2009, so it doesn't seem likely that a pressure transducer was mistakenly left out of the rule, even though one is legal through R78-D.

However, it also appears that no one has asked about a pressure transducer in Q/A since at least 2009, so maybe a mistake could have propagated that long.

Worst Q/A can do is say that the rule stands as written.

A long time ago (probably sometime between 2002-2004), a pressure transducer was included in the kit, but I don't remember anyone using it.