You'll contantly get the red exclamation point on your dash w/o TPMS. The system will be looking for the sensors in the tires and won't be getting a return signal since they're not there. Hence the warning on your dash. I dislike ignoring dash lights, so I bit the bullet and bought a set of sensors for my snows.
I bought my monitors from Sunset Porsche. Not sure if the monitors from Tire Rack will work or not. Didn't want to spend the $$$ and find out they didn't. Wasn't much difference between Sunset and Tire Rack to take the chance.
But that's just me.
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GPRPCA Chief Driving Instructor
2008 Boxster S Limited Edition #005
2008 Cayman S Sport - Signal Green
1989 928 S4 5 spd - black
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