It’s time to fill the shock reservoirs with nitrogen. Kartek’s liquid-filled pressure gauge is built with rugged use in mind; the liquid-filled gauge is able to withstand clattering toolboxes and rough access roads while staying accurate. Yes, many off-road shops have nitrogen-filling equipment, but owning it yourself lets you fill your shocks over and over no matter what the hour or day. It’s empowering. Start by threading the pressure gauge in place on the end of the shock reservoir’s Schrader valve.