VDO Temperature Sender 250°F/120°C Floating Ground - 3/8-18 NPTF

The VDO Temperature Sender 250°F/120°C Floating Ground with 3/8-18 NPTF threading is a precision marine engine monitoring instrument designed for boaters who demand accurate, real-time coolant temperature data. This sender provides critical feedback to your vessel's gauge cluster, enabling early detection of overheating conditions before catastrophic engine damage occurs—essential protection whether you're running a weekend fishing trip or pushing offshore in challenging conditions.

Operating across a 6–24V input range, this floating ground sender delivers compatibility with virtually all modern marine electrical systems, from smaller recreational outboards to larger cabin cruisers and fishing vessels. The 3/8-18 NPTF thread is the standard marine engine block connection point, ensuring straightforward installation without adapter fittings. Maximum temperature scale of 250°F (120°C) covers normal marine engine operating windows with margin for early warning of thermal stress. The 0.25-inch spade connector integrates with OEM and aftermarket gauge clusters using industry-standard wiring—no proprietary harnesses required.

VDO temperature senders are installed across commercial fishing fleets, charter operations, and recreational boating due to their reliability in salt-air environments and consistent gauge response. The floating ground design isolates the sender from engine block ground potential, reducing electrical noise and improving gauge needle stability—particularly valuable on vessels with aging or compromised grounding systems. Replacement of a failed or aging sender prevents false high-temperature readings that can lead to unnecessary engine shutdown or erratic gauge behavior.

Sold as an individual unit. If your engine's temperature gauge has become erratic, reads continuously high, or has stopped responding entirely, the sender is often the culprit. Reference component number 805/1/5 when cross-checking OEM compatibility or consulting marine service documentation.