Do you have a tire gauge for safety reasons? If you have a Solar Powered Digital Tire Gauge($12), cool! Car gadget tire gauge built-in digital LCD display pressure settings which can be selected from Psi, Bar, Kpa to Kg/cm2 with press of a button, and with the built in extendable depth ruler. The gauge can automatically turn off after a few seconds. Made in China, this product is directly available from Chinavasion for as low as $12.
