My wifes Cadillac has the TPMS monitors that warn you when pressure drops which is a nice feature it even e mails you if it is too far out of whack  It is also nice to click a few buttons upon nitial startup to see all thepressures compared to getting down at each rim. They do make a set of valve stems that have a built in gauge i remember seeing.
What got me to thinking was how far off my tres were dissapointed that my mileage was so far off last tank mostly because of my negligence 
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2012 Chevrolet Traverse *active*
2002 Oldsmobile Alero GLS *active*
2002 S10 2wd p/u 139,000mi. *active*
1975 Corvette Stingray *active*
1994 Camaro Z28 Convertible 149k *Sold 2013*
1998 Blazer ZR2 189k *Sold 2012*
1995 Tahoe LT 250k *Sold 2011*
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