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Tachometer Will Not Operate

WARNING: This page is about a different car, the 1985 Nissan Maxima and 1985 Nissan 200SX. However, it is still accessible from the selected car via links, so may be relevant.
  1. Perform SIGNAL CHECK  . If results are not okay, proceed to step 2). If results are okay, check ignition signal circuit. To do so, turn ignition switch to "ON" position. Measure voltage between terminal No. 3 (+) and No. 4 (-) of control unit wire harness. If circuit is okay, replace control unit. If circuit is not okay, check resistor and wire harness between tachometer and ignition coil.
  2. Perform DISPLAY UNIT CHECK  . If results are okay, replace control unit. If results are not okay, proceed to step 3).
  3. Perform POWER UNIT CHECK  to check power unit output voltage to tachometer. To do so, measure voltage between terminal VDL (Red) and GND (Black). If results are okay, replace display unit. If results are not okay, replace power unit.
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