What is this?

[black rocket]

Yes, even manual transmission have neutral and 5th & rev sensor.

As to the bolt on tag is concerned...I don't know what else to tell you.

[AusTexRex]

Picture # 1 is bolted to the transmissions housing right underneath the driver's side of the slave cylinder. I don't remember exactly what it is though, sorry.

I can't see where it even is in pic #2

And yes the flywheel nut is torqued to 300 ft-lbs