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The word "How?" springs to mind at this point.
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With all the problems this past year with tires, how about a valve stem that changes color or whistles when tire pressure is inadequate?
Scroll down, look for "inflation" [krelnik, Oct 04 2004, last modified Oct 21 2004]
Daimler-Chrysler concept vehicle [krelnik, Oct 04 2004, last modified Oct 21 2004]
Tire Pressure Indicator [SystemAdmin, Oct 04 2004, last modified Oct 21 2004]
Exactly what you want
Buy this !!!! [SystemAdmin, Oct 04 2004, last modified Oct 21 2004]
||I have heard that the valve stems that change color are already out, if so where can I purchase them for a 1999 Chrysler Sebring Convertible? Send e-mail to email@example.com. Thank you.
||googlewhacked. Also, when I did a search on google with the query "color + 'valve stem'" the first result I got back was this very idea on the halfbakery.
||The Hummer not only can check your tire pressure on-the-fly, it can also change the inflation using an onboard compressor. (See link). Don't think you even have to get out. Probably too expensive to retrofit onto regular cars, but I bet the gauge part could be made cheap if mass produced. Apparently it is starting to filter down into SUV concept vehicles, see second link.
||They have valve stem covers that show the air pressure on some kind of weird colerful gauge. Ive seen them before and i couldnt quite figure it out.
||The 2003 Pontiac Bonneville I rented could reset the tire pressure with the push of a button on the dash.