As seen in the IT Shop manual. This handy pressure gauge is found on pages 10 through 12. It can be used for numerous hydraulic diagnostic functions like accurately setting the steering centering which can be a real stinker to do by trial and error without this gauge, orr use the gauge to set steering system operating pressure. All the text for these projects can be found in the IT Service manual. Our Gauge is a high quality long lasting tool filled with glycerin to dampen surges and ease reading. You will love the feel and operation of this tool. Our customers say "This tool makes a fun quick project of steering problems". Hand made in the USA by JD Heritage.