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Tachometer Inaccurate

WARNING: This page is about a different car, the 1997 Mercury Mountaineer and 1997 Ford Explorer. However, it is still accessible from the selected car via links, so may be relevant.
  1. Turn ignition switch off. Remove instrument cluster. See INSTRUMENT CLUSTER  under REMOVAL & INSTALLATION. Measure resistance between ground and instrument cluster connector C286, terminal No. 16 (Black/White wire). See Figure . If resistance is less than 5 ohms, go to next step. If resistance is more than 5 ohms, repair open in Black/White wire between instrument cluster connector and ground and retest system.
  2. Measure resistance of printed circuit between tachometer pins (in center of clips) and corresponding instrument cluster connector C286, terminals No. 13, 15 and 16 and connector C287, terminal No. 2. If all resistances are less than 5 ohms, replace tachometer and retest system. See GAUGES  under REMOVAL & INSTALLATION. If any resistance is more than 5 ohms, replace instrument cluster printed circuit. See PRINTED CIRCUIT  under REMOVAL & INSTALLATION.
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