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Home >> Chevrolet >> 1995 >> Corvette Base, 2D Convertible, Standard >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Instrument Panel - Electronic >> Testing >> Instrument Cluster & Panel Displays >> Tachometer Does Not Operate Properly

Tachometer Does Not Operate Properly

  1. Check for moisture in firewall harness connector, located above battery and below cruise control servo unit. Repair as needed.
  2. Turn ignition on, engine off. Disconnect Gray 2-pin connector at opti-spark ignition coil. Connect Signal Generator/Instrument Panel Tester (J-33431-B) into 110V wall outlet. Connect Harness (J-33431-10) from instrument panel tester to White wire of Gray 2-pin opti-spark ignition coil connector and ground.
  3. Set tester controls to ON position and to 54 MPH. If tachometer indicates about 900 RPM, problem is faulty opti-spark ignition coil. If tachometer does not indicate about 900 RPM, check for open, short to ground or short to battery voltage in White wire between tachometer and opti-spark ignition coil.
  4. Also check for open or short to ground to tachometer filter. If White wire and tachometer filter are okay, replace instrument cluster.
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