What Do the Two Pointers on a Car Tire Pressure Gauge Mean?
3 Answers
The two pointers on a car tire pressure gauge represent PSI (pound-force per square inch) and KG/CM2 (kilogram-force per square centimeter) respectively. Below is an introduction to car tire pressure gauges: Principle of the Pressure Gauge: Inside the gauge body, there is a calibration rod used to read pressure measurements. The calibration rod is located above the piston but is not connected to it; instead, it is linked to the plug. When the piston moves to the right, it pushes the calibration rod. Upon releasing the pressure, the piston moves back to the left, while the calibration rod remains at its maximum displacement, allowing the pressure reading to be taken. How to Check Tire Pressure with a Pressure Gauge: First, press the buckle and align it with the tire valve. Then, push it forward fully to secure the valve and release the buckle. For digital gauges, there is usually an activation button on the display. Pressing this button will illuminate the screen, which is helpful in low-light conditions. You can then check if the data values are within the normal range. Digital pressure gauges directly display the pressure value.
There are two needles on the air pressure gauge? Oh, that's a good thing! Actually, the solid needle on the left shows the actual value of the current tire pressure, and it moves when you inflate or deflate the tires. The small needle with color markings on the right is the preset ideal tire pressure, usually labeled as 'recommended value' on the dial, such as around 35 PSI. I guess the gauge you saw is a manual type, designed with two needles for easy comparison—for example, if the current pressure is too low, with the solid needle at 20 and the preset needle at 35, you know it's time to add air. This thing can prevent tire blowouts and save fuel. I often forget to check the tire pressure myself, and then the fuel consumption keeps rising. Remember to check at least once a month, and it's most accurate when measured in the morning with cold tires. Don't wait until something happens on a long trip—it might be too late. Recommended values may vary by manufacturer, so check the label on the door frame for clarity.
I see you're asking about the two needles on a tire pressure gauge, which is pretty common stuff. The left needle shows the actual tire pressure reading—just press it onto the valve stem and it pops up. The right needle is fixed at a certain point on the dial, indicating the recommended value, say around 35 psi. This design makes it super intuitive; one glance tells you how much air you need to add. As a DIY car maintenance enthusiast, I once ignored tire pressure and ended up with a slow leak. My advice: check it every time you wash your car—don’t just rely on the onboard alert system, which can glitch occasionally. Also, mind seasonal changes—pressure drops in winter and rises in summer. Proper adjustments extend tire life and save money. Digital gauges are more precise, but old-school mechanical ones are cheap and durable. Just don’t exceed 50 PSI to avoid risks!
