Classic Instruments Fuel Tank Sending Unit

Classic Instruments Fuel Tank Sending Units: Precision Built for Classic Builds

When you invest in a beautifully crafted gauge cluster for your hot rod or street rod, the last thing you want is an inaccurate fuel reading. That's where Classic Instruments sending units come in — purpose-built companions to ensure your fuel gauge tells the whole truth, every time. As a brand that has spent over 45 years at the forefront of automotive instrumentation, Classic Instruments brings that same commitment to accuracy and quality to their line of fuel tank sending units.

Engineered for Compatibility and Accuracy

Classic Instruments manufactures their tank senders to conform to most OEM electrical resistance specifications, making them a natural fit whether you're working with a stock tank or an aftermarket setup. The brand also assembles many of its fuel gauges to read correctly when connected to the original or stock tank sender — meaning the sender and gauge work as a carefully matched system rather than an afterthought.

The lineup covers a wide range of ohm configurations. Adjustable models like the SN35 (240–33 ohms), SN36 (0–30 ohms), SN38 (0–90 ohms), and SN39 (75–10 ohms) give builders the flexibility to match virtually any fuel gauge on the market. This adjustable design is especially valuable in custom and classic builds where mixing gauge brands or using a non-stock tank is common. For tube-style applications, the SN35T4 offers a 240–33 ohm range in a design suited for specific tank configurations.

Internal-Float Design for Stable Readings

One standout innovation in Classic Instruments' sending unit lineup is their internal-float design. This advanced approach provides accurate fuel level readings without the fluctuations caused by fuel slosh — a common nuisance with traditional arm-and-float setups. Because the internal-float unit requires no float arm, it's well-suited to custom tank configurations where clearance and movement can be a concern.

Made in the USA by Enthusiasts, for Enthusiasts

Every Classic Instruments product is designed, assembled, and calibrated in Boyne City, Michigan. The brand's proudly American-made ethos means each sending unit is built with the same attention to detail applied to their legendary gauge clusters. These are parts made by street rodders, for street rodders — and that philosophy carries through to every component, including the sending units that keep your dash reading right.

Whether you're building a period-correct classic, a full custom street machine, or matching a new gauge set with an existing tank, Classic Instruments' fuel tank sending units offer the ohm-range flexibility, quality materials, and gauge-system compatibility that serious builders demand. Explore the full range of Classic Instruments products to find the sender that pairs perfectly with your project.