A handheld pressure gauge is a relatively modest investment, with many selling for $10 to $22 on Amazon. ... “They are designed to work best when properly inflated.

Complete Routine Work With These Analog Tire Pressure Gauges. No pressure, but you should always have a tire pressure gauge handy. By Serena Bleeker. December 4, 2019.

Once the volume becomes lower than what's recommended, the sensor tells your car to turn on the tire pressure indicator on your dashboard. This way, you'll know it's time to get your tires inflated.