Mmm, gorgeous car. Just a few comments:
On the 1995+ Legacy, there is no speedo cable. Since very little else changed from 1994 to 1995, I'm guessing you don't have one either. I actually have a spare instrument cluster from a 1995, but I don't think it'll do you any good.
For CFD software, if you're willing to pay thousands, SolidWorks Cosmos FloWorks (not FloWorks Express, which is pretty much a teaser) is easy to use, but it doesn't have as many features as I'd like. Sure, you can do simulated wind tunnel testing, draw streamlines over your car and all that. It can report the force exerted on a single surface by the flow. But it wasn't able to tell me the Cd of the model I drew, and I really couldn't get it to quanify the difference between my model with and without mirrors or wheel skirts.
OpenFOAM seems like a respected open-source CFD toolbox, but you'd better be a computer programmer to get it to run. You'll also need to be running Linux, in a VM or otherwise.
What speed did you do the tuft testing at?
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