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Where is the sensor of 50 forklift engine tachometer?
Usually on the blade flywheel.

Generally speaking, the engine speed sensor is installed on the clutch housing of the distributor and gearbox. At the front or back end of the crankshaft, the pulse signal speed sensor is used to measure the engine speed.

The speed sensor on the engine is a Hall sensor, which works through the signal teeth on the flywheel and converts magnetic signals into electrical signals through semiconductor components. This kind of sensor can work without touching the measured object.