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Several years ago there was an article posted on the web site of an Australian car magazine that does a lot of hands-on how-tos and more science-related stories...wish I could remember the name of the rag. They had a fairly low-cost setup that used a small pressure switch and a digital multimeter that would beep when it detected continuity. The switch would be taped to the car in the area where they wanted to check the pressure buildup and wires ran inside to the DMM where the driver would check the speed on GPS or the speedo when the DMM beeped on detecting continuity. The switch would close at a given pressure setting, so the trick was to measure the vehicle speed at which the pressure grew enough to close the switch. Making aerodynamic improvements increased the vehicle speed required to close the switch.
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