tachometer to stop working?

1992 FORD MUSTANG
90,000 MILES
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LARRYMCCONNAUGHHAY
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What would cause a tachometer to stop working on a 1992 ford mustang with automatic transmission. It is stuck showing 3500 rpm but motor is running properly. The tach guage shows 3500 rpms but the motor is running at normal idle speed
Mar 15, 2012 at 2:09 AM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
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