Are Tire Pressure Indicator Caps Worth the Money?
Tire pressure indicator caps are gaining popularity because they make reading your tire pressure very easy. Many drivers do not know how to use a tire pressure gauge and because under inflation causes tire damage and reduced gas mileage, this tool is a plus. Tire pressure indicator caps take the pain out of ensuring your tires are properly inflated. The caps are sold in 32 psi and 36 psi sizes, and they are priced starting at $5.99. This is a pretty small price to pay for a tool that will enable you to monitor your tire inflation at a glance.
For more info, see A Tire Pressure Sensor Buyer's Guide