This might sound stupid, but have you tried Nissan (for genuine parts)?
Failing that, have a look on eBay; I'm absolutely sure that the det sensor for any SR20DE(T) will work - they all have the same part number.
I wouldn't be surprised to find the coolant thermocouples are the same too.
I had an identical problem - a connector (F7 on schematic) was disconnected, and takes the det and temp sensor wires. It is at the lower front nearside of the engine, hidden by the loom. See http://www.gtirworkshopmanual.com/default.aspx?v=2387 and ECCS_DIAGRAM.PDF
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