GearWrench 3289 Oil Pressure Check 10pc Kit GearWrench 3289 Oil Pressure Check 10pc Kit is designed to test engine oil pressure on most passenger cars and light trucks, the guage is calibrated to read max pressure from 0 to 100PSI. Five differend adapters are included in the GearWrench 3289 Oil Pressure Check 10pc Kit for both domestic and imported engines.