Lezyne Steel Floor Drive Floot Pump with 3.5" Gauge, ABS Pro Head, Silver

I've had this pump for a month or so. It has 2 major problems. One is that the gauge is very inaccurate. It varies wildly with every stroke of the pump. The gauge will read 25 lbs on one stroke. The next, it reads 29 lbs. The next 18 lbs. The next 32 lbs. The next 21 lbs. The gauge is basically worthless. Second is the attachment system. I bought this pump so I could screw the end onto my tire valves. I thought that would be better than the competitors' lever attachments. However, the pump head mechanism is so difficult to turn, I have to use a wrench to get it on or off. It is very stiff and does not loosen up with use. This means it takes many minutes to attach or detach the pump head. Kind of defeats the system. The other pumps' flip-on methods look much better now.