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Tachometer Not Reflecting Correct Engine Speed

WARNING: This page is about a different car, the 1997 Lincoln Mark VIII. However, it is still accessible from the selected car via links, so may be relevant.
  1. Turn ignition on. Connect and operate New Generation Star (NGS) Tester (007-00500) following manufacturer's instructions. Retrieve HEIC continuous and self-test DTCs. If DTC U1027 is present, see TESTS W/CODES article in ENGINE PERFORMANCE section. If DTC U1027 is not present, go to next step.
  2. Using NGS, select HEIC active command TACHOMETER CONTROL. Trigger TACHOMETER ON. Adjust NGS scroll knob until command TACHOMETER reads 50 percent and observe tachometer reading. Adjust NGS scroll knob until command TACHOMETER reads 100 percent and observe tachometer reading. Tachometer needle should start at zero, move to about half at 50 percent and upper limit at 100 percent. If tachometer performs as specified, tachometer is operating properly. Check engine operating system for other possible problems. See TESTS W/CODES article in ENGINE PERFORMANCE section. If tachometer does not perform as specified, temporarily substitute a known good HEIC and retest system.
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