Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSPONTIAC1987FIERO GT, STANDARD, MG3REPAIR AND DIAGNOSISELECTRICALGAUGESINSTRUMENT PANEL - ELECTRONICTESTINGTACHOMETER
1987 Pontiac Fiero GT, Standard, MG3
Instrument Panel - Electronic: Testing: Tachometer
1987 Pontiac Fiero GT, Standard, MG3SECTION Tachometer
- Disconnect ignition coil connector (VIN 9) or direct ignition system connector (VIN R). Install Instrument Panel Tester (J-33431) to the ignition coil connector (VIN 9) or system connector (VIN R). Install Harness Connector (J-33431-4) or (J-33431-10) between instrument panel tester and ignition coil or system connector.
- Connect ground lead of tester. Turn ignition switch to the "RUN" position. With tester on, set speed signal to 54 MPH. If tachometer reads 1350 RPM (VIN 9) or 1800 RPM (VIN R), check coil connector (VIN 9) or system connector (VIN R). If tachometer does not read correctly, check White wire for an open circuit. If okay, replace tachometer with a new unit.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.