The John Deere AL55291 is a genuine OEM tachometer designed for a wide range of John Deere agricultural tractors. This essential instrument provides accurate engine RPM readings, crucial for monitoring engine performance and ensuring optimal operation. It is compatible with various John Deere models, including the 840, 940, 1020, 1030, 1040, 1120, 1130, 1140, 1350, 1550, 1630, 1640, 1750, 1830, 1840, 1850, 1950, 2020, 2030, 2040, 2120, 2130, 2140, 2250, 2350, 2450, 2550, 2650, 2750, 2850, 2950, 3030, 3040, 3050, 3120, 3130, 3140, 3150, 3350, 3640, and 3650 series. Weighing approximately 0.23 kg, this replacement part ensures reliable functionality and maintains the original equipment standards of your John Deere machinery.