Tachometer not working properly?

1996 NISSAN PATHFINDER
200,000 MILES • 3.3L • 6 CYL • 4WD • AUTOMATIC
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DV2020
  • MEMBER
  • 2 POSTS
So, the tachometer is going crazy. doesn't seem to affect transmission. it's just going haywire. What could be the cause?
Feb 3, 2023 at 10:01 PM
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STRAILER
  • Experienced Mechanic
  • 55,118 POSTS
This can be caused by one of two things either the ignition system is back feeding into the tachometer circuit or the tachometer itself is going out. Can I ask if the engine is misfiring? If it has been a while, I would change out the spark plugs, cap, rotor and spark plug wires. Here is a generic guide to help walk you through the steps with instructions below for your truck.

https://www.2carpros.com/articles/how-to-change-spark-plugs

Check out the images (below). Please let us know what you find.
Feb 4, 2023 at 4:47 AM
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