This is the latest product from EZ Air Ride! This air ride gauge fully compliments our Spare Air Kit. Before that can happen, you have to fill your tank for the first time. This gauge will enable you to monitor your tank's air pressure during that first fill. Once the initial fill up is complete, just throw the gauge in your glove box until you need to check your tire's pressure. If you find that your tires are a little low, just pop in your on-board Spare Air hose and chuck. Back on the road in no time. Long gone are the days of searching for a service station with a decent air compressor!