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I had this replaced on my old WRX. Yes it is on the gearbox but I can't remember where . My local Subaru dealer did mine for £65 all in including the sensor.
On the STI 6-speed box it's located towards the back. It's also on top so you need to drop the box a couple of cm's to allow you to remove it. Not to be confused with the reverse switch.
I had my switch "modified" by replacing the original 2mm thick brass washer with a 1mm one which solved the vibrating on/off issue.
Ive a NPS for sale at the moment bought it for my STi but have now sold the car so its sitting in the house unused and never fitted would let it go for £25 of the queens finest notes