AUTO METER Cylinder Head Temperature Sender 2259 — 1/8" NPT shallow-depth replacement for 1995+ short-sweep gauges

The AUTO METER 2259 is a compact 1/8" NPT electric cylinder head temperature (CHT) sending unit engineered as a shallow-depth replacement for 1995-and-later short-sweep gauges.

This sending unit is built to fit tight mounting locations where standard senders sit too deep, offering compatibility with AUTO METER short-sweep electric CHT gauges and other short-sweep water, oil, or transmission temperature gauges that previously used sender 2258. Its reduced profile helps installers avoid clearance conflicts on cylinder heads, intake manifolds, or accessory housings while maintaining reliable temperature signal output for accurate gauge readings.

Will this sender fit my existing AUTO METER short-sweep gauge?

Yes—when paired with AUTO METER short-sweep electric cylinder head temperature gauges from 1995 or newer, the 2259 provides direct replacement functionality. It uses a 1/8" NPT thread and is intended specifically for gauges that require the short-sweep signal characteristics.

• Thread size: 1/8" NPT for standard compatibility.
• Designed for short-sweep electric CHT gauges dated 1995 and later.
• Works as a shallow-depth option where sender 2258 would be too deep.

How does the shallow-depth design help during installation?

The reduced insertion length prevents interference with nearby components, making it ideal when space around the sensor port is limited. This minimizes the need for adapters or custom fittings and simplifies mounting on cylinder heads, manifolds, and sensor bosses.

• Saves clearance in tight engine bays and behind accessories.
• Reduces risk of thread damage from forced installs.
• Eliminates extra extension fittings in many shallow ports.

Can the 2259 be used for water, oil, or transmission temperature gauges?

Yes—beyond cylinder head temperature gauges, the 2259 is compatible with short-sweep electric water, oil, and transmission temperature gauges where the original part was the 2258 and clearance is a concern. Verify the gauge's electrical specifications and mounting thread before installation to ensure proper operation.

• Compatible with short-sweep electric temperature gauges using 1/8" NPT senders.
• Suitable substitute when sender 2258 can't fit due to depth limits.
• Check gauge requirements (1995+ short-sweep models) for compatibility.

What should I check before replacing my sender?

Confirm the gauge model year and sweep type, inspect the sensor port thread and depth, and verify electrical connections match the gauge lead. Proper sealing and torque are important—use appropriate thread sealant or tape compatible with temperature sensors to avoid leaks and ensure accurate readings.

• Confirm your gauge is a 1995-or-later short-sweep model.
• Measure port depth and thread size (1/8" NPT) before purchase.
• Use correct sealant and avoid over-tightening the sender body.

Who is this for? The AUTO METER 2259 sending unit is aimed at gearheads, mechanics, and custom installers who need a reliable short-sweep temperature sender that fits where standard-length units do not. It’s especially useful for older or tightly packaged engines, custom manifolds, and restoration projects where maintaining factory gauge operation without modifying mounting bosses is a priority.