140-280 Oil Temp Gauge with 12ft Capillary Tube

The AutoMeter 140-280 Oil Temp Gauge with 12ft Capillary Tube (Model 5443) is a mechanical, full-sweep analog temperature gauge designed for direct engine oil monitoring. This 2-5/8 inch diameter instrument features a liquid-filled black face that maintains needle stability and readability across the complete 140–280 degree Fahrenheit operating range. The extended 12-foot capillary tube allows flexible mounting options, separating the gauge face from the sensing bulb for installations where space or heat proximity constraints would otherwise limit placement.

The full-sweep mechanical design provides immediate, needle-based temperature indication without electronic components or power requirements, making it reliable for harsh environments where sensor durability matters. The capillary tube construction uses thermal expansion principles: as engine oil temperature changes at the remote bulb, pressure transmits through the sealed tube to move the internal needle across the gauge face. Liquid filling dampens needle oscillation, reducing vibration-induced flutter common in mechanical gauges and ensuring stable, accurate readings during engine operation. This gauge is engineered for OEM and aftermarket engine installations where direct temperature feedback is essential for monitoring engine health and preventing overheating.

This instrument suits engine builders, hot rod enthusiasts, heavy equipment operators, and anyone requiring a fail-safe oil temperature monitoring solution. The 12-foot capillary tube provides sufficient length for dash-mounted gauges in most vehicle and equipment configurations, while the compact 2-5/8 inch face fits standard gauge clusters and aftermarket panels. Mechanical operation eliminates dependency on sensors or electrical systems, ensuring temperature indication remains available even if engine management electronics experience failure.

AutoMeter is recognized for manufacturing quality analog gauges and engine monitoring instruments across automotive, marine, and industrial applications. The 140-280 range covers optimal engine oil temperatures (roughly 160–220°F for most engines) plus safety margins, allowing operators to quickly identify undercooling (cold start) or overheating conditions before damage occurs.