Industrial 805544T Knock Sensor Assembly Automotive Grade

Industrial 805544T Knock Sensor Assembly is an aftermarket, automotive‑grade replacement designed to plug into Mercruiser, Volvo Penta, and OMC engines that use the 805544T family of knock sensors, offering a direct cross‑reference to common OEM numbers. It is listed as cross‑compatible with Mercruiser 805544T, 8M0077616, Volvo 3854512, and 36854512, and is frequently sold under the Sierra 18‑7703 label as a knock sensor replacement in Mercury Marine/OMC installations. In marine applications, this sensor is typically used on Mercruiser 7.4L and 8.2L big‑block configurations, where it monitors combustion knock and provides feedback to the engine management system to help optimize spark timing and safeguard the engine from detonation. This part is positioned as a cost‑effective alternative to OEM sensors, enabling maintenance and replacement without compromising compatibility with the established sensor mounting, electrical connector arrangement, and signal range of the 805544T family.