Then I stuck in a boost gauge, which measure the air pressure at the intake manifold. This is essentially a measure of the throttle response, and corresponds directly with the amount of fuel being burned (and therefore of power being generated). So I can see how the needle fluctuates if I press slightly differently on the accelerator pedal to see the effect.
Next I installed a third-party top controller, which allows me to operate the top from the key remote, as well as while the car is in motion. For some reason, although the European-spec Audis can operate the top while in motion, their American counterparts can't. But now I can. :)
Overall, installing these various components was fun and very educational. Here are a few pictures. For the boost gauge install, I had to remove a wheel to route a hose from the cabin into the engine compartment. For the top controller, I had to remove one of the interior sides. For both I had to tap into the wiring system.
