The most important decision when choosing an analog air gauge is to get a gauge that works within the pressure range of the tires that you will be using the gauge on. For example, if you run 30 psi in your tires then you should get a 60 psi gauge. If you run 15 psi then you should get a 30 psi gauge. Tire pressure gauges work best in the middle of their range. All Longacre tire gauge models come in a variety of pressure ranges to help you get the most accurate gauge for your application.