Last week while having the wife's wheels changed, there was a guy in the store having Tire Sensors installed on his Jaguar. /phpBB/images/smiles/icon_confused.gif This might be a good solution for monitoring the tire pressure on the wife's Z so I don't have to worry about her getting stranded, like I did once!! 
I did some checking and found out he got them from www.tirerack.com.
Here is a link to the sensors. It's called Smart Tire. It is a PDF file so you will need Adobe Acrobat. (Acrobat is a free download.)
http://www.smartire.com/pdf/na/smartire_products.pdf

I did some checking and found out he got them from www.tirerack.com.
Here is a link to the sensors. It's called Smart Tire. It is a PDF file so you will need Adobe Acrobat. (Acrobat is a free download.)
http://www.smartire.com/pdf/na/smartire_products.pdf