1994 Chevy Truck Erratic speedometer and tachometer

1994 CHEVROLET TRUCK
112,000 MILES • V8 • 2WD • AUTOMATIC
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RBD
  • MEMBER
  • 1 POST
I am getting erratic readings on my speedometer, Tach and amp meter. Also while at idle, you can see the fan display go dim and get bright again and hear the sound of a relay clicking. Any thoughts?
Jul 31, 2008 at 11:21 AM
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RASMATAZ
  • ✓Experienced Mechanic
  • 75,992 POSTS
Get the charging system checked out to rule out the alternator
Jul 31, 2008 at 11:25 AM
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