556915C91 Engine Tachometer Speed Sensor Replacement for Navistar International Truck MV HV LT Durastar Workstar 1669290C91 450590

Product Overview The 556915C91 / 1669290C91 Electronic Tachometer Transmitter Sensor is a premium, heavy-duty vehicle electronics component engineered specifically for Navistar International Trucks, IC Commercial Buses, and Heavy Industrial Drivetrains. Featuring a heavy-duty threaded steel body (standard 3/4″-16 thread specification), this high-accuracy magnetic pickup sensor accurately monitors engine rotational speed (RPM) and crankshaft position by detecting passing gear teeth. It converts mechanical rotation into precise electrical pulse signals, routing them directly to the dashboard tachometer gauge, speedometer unit, and the vehicle’s onboard management system. This ensures optimal engine timing control, smooth shifting, and precise driver instrument feedback, making it an essential replacement part for commercial heavy duty transport fleets. Technical Specifications Main OE Number: 556915C91, 1669290C91 Interchangeable Numbers: 556915, 556915C91ATL, CLG922DK012 Aftermarket Industry Cross-Ref: PAI Industries 450590, Mack 4333-556915C91, 5MT2033C Thread Specification: 3/4″-16 Threaded Heavy-Duty Steel Chassis Overall Length (OAL): Standard 30.60 Inches (Including heavy-duty anti-chafe wiring tail) Function: Converts Engine/Flywheel Mechanical Rotation to Tachometer and Speedometer Electrical Signals Condition: 100% Brand New Premium Aftermarket Replacement Broad Vehicle Compatibility This heavy-duty tach transmitter sensor features an extensive application profile, crossing over multiple generations of International medium-to-heavy duty commercial vehicle chassis and regional buses: Vehicle Category Compatible Models & Applications International Modern Vocational Trucks MV, HV Series Medium & Heavy Duty Work Trucks; CV, LT, HX, and Lonestar Highway Tractors International Classic Fleet Trucks Durastar, Workstar, Paystar, 9200, 9400, 9400i, 9900i Commercial Semis and Dump Trucks IC Bus Applications IC Bus CE Series School Buses, Commercial Transit Shuttles, and integrated Navistar-diesel passenger frames Industrial Machinery Select industrial engines and heavy crawler construction machinery (e.g., cross-referencing CLG922DK012 specifications) Key Benefits OEM-Equivalent Fitment: Engineered to match original Navistar dimensions and electrical output curves perfectly, providing a seamless plug-and-play installation without gauge re-calibration. Severe Operating Durability: Rigidly enclosed in a premium metal housing and high-temp protective conduit to withstand engine block heat cycles, road salt, mud, water sprays, and chassis vibrations. Precision RPM Display: Instantly corrects common heavy-duty dashboard faults such as jumping tachometer needles, frozen odometer/speedometer displays, or false transmission slip warning codes. Secure Sealing: High-grade threaded casing design ensures a leak-free fit into the flywheel cover or transmission housing under sustained operating pressures. Cross-Reference Guide This sensor interchanges with the following original and aftermarket part numbers: NAVISTAR / INTERNATIONAL: 556915C91, 1669290C91, 556915, 556915C91ATL MACK TRUCKS: 4333-556915C91 PAI INDUSTRIES: 450590 OTHER CORRELATIONS: 5MT2033C, CLG922DK012 industrial electronic accessories Maintenance Tip: If your International Durastar truck or IC CE Bus experiences erratic dashboard tachometer jumping, a dead speedometer needle, or rough automated shifting transitions, inspect the 556915C91 transmitter setup. Because this sensor is placed close to moving flywheel ring gears, the magnetic tip easily collects microscopic metal shavings and clutch dust over millions of revolutions. Before bolting in this new replacement unit, we highly recommend unscrewing the old plug, wiping down the inductive sensor tip area, and ensuring the wire lead pins are free from oil mist or moisture intrusion.