In my mind, it becomes harder when the dials have to move themselves to respond to bearings from your scope...
so...
the tdc would have to know where all the (real) dials are pointed, and tell that to the game (which would need reprogramming to read that)
and
the game would have to tell the tdc where all the dials should be pointed (it can get sticky here)
hmm... hold on.
edit: they can hook up car gauges to driving games, so there might be some success possible in displaying information, but getting info to input might be really challenging.
If you wanna make the hardware first, I'd look at projects like "arduino" and search google for things like "game gauge"
I'm sure it's possible, but I'm also sure it won't be easy. Be the first to do it!