Aftermarket speed sender (OE 266-8577) for Caterpillar 988H and 992G wheel loaders, 834H and 854G wheel dozers — monitors engine or transmission output shaft speed via gear teeth to drive analog tachometer gauges in C18, C27, and C32 industrial diesel engines.
This is a passive magnetic pickup (variable reluctance type), not a powered digital sensor. It generates an AC voltage pulse as gears rotate — providing a direct signal to mechanical or analog tachometers without ECU involvement, software, or emission system linkage.
Sealed stainless steel housing with rugged connector resists extreme heat, vibration, oil, and dust in demanding mining, quarrying, and heavy earthmoving applications across North America.
Direct OEM-fit replacement with identical mounting flange, air 2026 tolerance, and electrical output profile. Install in minutes using standard tools — no calibration or wiring changes required.
⚠️ For off-road Caterpillar construction and mining equipment only. Not approved for on-highway vehicles, agricultural tractors, marine engines, irrigation systems, pesticide sprayers, or refrigeration units.