VDO Reed Switch Fuel Sender - 660 MM

The VDO Reed Switch Fuel Sender - 660 MM (MPN 226-666) is a precision marine fuel measurement system engineered for boats where traditional swing-arm designs won't fit due to space constraints. Unlike conventional aftermarket fuel senders that rely on rotating float arms and resistance cards—which can produce erratic gauge needle movements—this reed switch design delivers stable, accurate fuel level readings without the feedback noise caused by fuel slosh and tank movement.

The 660 MM tubular design acts as a mechanical dampener, isolating the fuel gauge pointer from the rapid oscillations that occur during acceleration, turns, and rough water conditions. This stabilization is critical for offshore and coastal boating where seas are variable and fuel tank movement is constant. The reed switch mechanism triggers at discrete fuel levels rather than providing continuous resistance variation, eliminating the pointer flutter that plagues conventional senders and making fuel levels easier to read at a glance. The compact tubular profile fits into narrow tank mounting locations where larger float-arm assemblies cannot physically be installed.

This fuel sender is ideal for boat owners upgrading older tanks, installing aftermarket tanks with limited internal space, or retrofitting vessels where OEM fuel sender placement is no longer practical. Both weekend anglers and serious offshore fishermen benefit from the reliable gauge performance and simplified installation process. The VDO brand carries decades of automotive and marine instrumentation heritage, ensuring compatibility with standard marine fuel gauge systems and long-term dependability in saltwater and freshwater environments.

Proper fuel sender selection is fundamental to safe boating—knowing your remaining fuel range prevents the danger of running empty at sea. The VDO reed switch design removes guesswork by providing consistent, readable output that responds to actual fuel level rather than vibration and motion.