The Nissan 300ZX Speedometer Cable connects the gearbox to the gauge located on the dashboard. In turn, this gauges the speed of the vehicle as determined by the rotation of the transmission. Enclosed in its case, a flexible inner wire revolves, the square ends fitting into matching sockets so that the magnet of the needle can generate eddy currents and move the pointer as the car speeds up. When the cable stays arranged smoothly, well lubricated and free from kinks, speed data will be accurate. Rounded ends, a crushed casing or a loose fitting will interrupt the signal and the needle will not move. The early Nissan 300ZX models built before 1993 when electronic speedometers became commonplace use a single mechanical Speedometer Cable. Meanwhile, trims that have cruise control may have an upper and lower Speedometer Cable pair, one for the gauge and the other for the control unit. Both styles require proper length, gentle bends and periodic greasing to reduce friction. If you hear weird needle twitching or ticking noises, your Nissan 300ZX Speedometer Cable is likely worn. Swapping in a new Speedometer Cable will restore dependable speed readings.
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