1987 Chevy El Camino Tachometer

1987 CHEVROLET EL CAMINO
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DON ERNST
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Electrical problem
1987 Chevy El Camino V8 Two Wheel Drive Automatic

My tach has 3 studs in the back that plug into 3 clips. What feeds each clip and what are the readings supposed to be for each. My tach goes all over,back and forth from o to max when running or just cranking. Any ideas?
Thanks, Don
Apr 11, 2010 at 8:33 AM
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HMAC300
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  • ASE Certified Mechanic
one might be a 12 volt supply one may be ground and another would be the tach going to the coil or where its 'pick up is. You probably have a bad tach.
Apr 15, 2010 at 4:36 PM
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