Board Thread:Theories and Speculation/@comment-26037879-20150601093706/@comment-1018594-20150601095006

You don't need to sign forum posts.

But to answer your question, from what I understand:

Sensor Types can sense all types of chakra, but to be specific: Nagato was able to reverse it and track Naruto (who was in Sage Mode) when Naruto tried to track him through his chakra receivers.

It's possible that dojutsu users can sense senjutsu, but there's no proof that they can. Neji noticed that Naruto's chakra signature was different in Kurama Chakra Mode, but Tailed Beast chakra and Sage Chakra aren't exactly the same thing.