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Would a program do the job ?
Programs read fan speed off the motherboard (unless that software came with hardware to plug fans in to...).
A fan controller is your best bet IMO. They all cost dollars. But I think for like $40 you can get a nice Lamptron that does that...some are cheaper too.
http://www.filehippo.com/download_speedfan/ I do not want money only to help a friend you could use it with the program i said before it is up to you? Just look at the post for the program and think about it got to go out back in 10 mins.
Multiply by 30 because the Hall effect sensor hits twice per rotation?
You can report it to software on the computer using a microcontroller fairly easily.
If you're patient I'll work something up using the TI MSP430 Launchpad.
The whole thing, including USB cable, is $4.30 from TI.