With LCD display, the most practical tire pressure gauge. ACC-2086:four display units: PSI,KPA,BAR,KG/CM ... uniform transfer driving force, uniform wear. How to know oneself car normal tire pressure? Open the driver's door, the door in the ... ( usually white ), with the car tyre pressure standard value ( usually 28~32psi ). Here to give you an experience reference: car tire pressure 32psi, SUV/Van ...