Using this carburetor pop - off gauge stand is easy. First, use the two 6mm bolts to attach your carburetor to the stand. The stand is adjustable, so you can fit different types of carburetors. If you have a Tillotson carburetor, you can use the end provided on the pop - off gauge tester to check the inlet needle pop - off pressure. The gauge display will show you the pressure from 0 psi to 36 psi or 0 - 2.5 bar. Remember, the Kartech fuel line and carburetor fitting ends are sold separately, so you'll need to click the dropdown to get them if you need. As for maintenance, keep the stand and gauge clean and dry. Wipe them down after use. And note that Comet Kart Sales and the manufacturer don't warranty these popoff gauges, so handle them with care.