Having problems with your 1986 Pontiac Fiero ?
Tachometer on my 1986 fiero gt is out of calibration it ,engine runs right but tachometer is off the graphs limits.
There's a good chance that the tachometer switch setting on the tachometer is broken. They use the same tach for different engine sizes and change the amount of cylinders with the switch. You might have to replace the tach
Repair Help & Product Troubleshooting for 1986 Pontiac Fiero
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