Okay shit, I just looked up the circuitry (http://en.wikipedia.org/wiki/File:Airspeed_Mech.SVG) involved in a real airspeed indicator and I may have to nix the functional bit. Li'l Tina may be overreaching herself a bit here.

Suffice to say, she knows what she wants to make, she understands the processes and the science behind it but she lacks the practical experience to pull it all together. She doesn't have the finesse and it'll frustrate her.

Yeah. I'm gonna go with that. :/