Gas gauges on boats are notoriously unreliable… In fact, boats are notoriously unreliable🤣 it’s very important with my skis and my boat that I have a completely mechanical timing device that allows me to roughly compute fuel burn. I also love that with the rotating bezel I can time two events at once i.e. total trip time, and time between refueling. I also love the fact that the pushers do not need to be screwed down and can actually be operated in the water.