Moeller 03575910 Direct Sight Mech Read Capsule Swingarm Mechanical Sending Unit With a direct sight gauge or with the conversion capsule gathers fuel level information with the float. While accurate the gauge will fluctuate as the fuel in the tank sloshes around the tank when boating because of the moving parts – the float. Direct site gauge is included with the sender. Attributes: Tank Depth = Replacement direct sight gauge.