94 Pete 379 Speedometer not working properly

Discussion in 'Peterbilt Forum' started by AFF888, Jan 27, 2022.

  1. AFF888

    AFF888 Bobtail Member

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    Jan 8, 2018
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    Hi, the speedometer was not working at all for months, now it reads inconsistently about 20 miles under the speed limit, sometimes nothing. The housing is cracked and looks like someone tried to patch it up with glue. Do you think this is a wiring issue or I need a new speedometer? Thank you!
     
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  3. bad-luck

    bad-luck Road Train Member

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    Most likely the speedo is bad. If your truck had an ecm you could plug into it to see if it was the speedo or not . But with a 94 your engine is mechanical correct?
     
  4. AFF888

    AFF888 Bobtail Member

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    Jan 8, 2018
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    yes
     
  5. bad-luck

    bad-luck Road Train Member

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    I have a 2000 pete 379, I replaced my speedometer around 5 years ago, it was around $300. If you can fine a speedometer shop they can diagnose it for you. I know a speedometer shop, it is in Pennsylvania. Don't know where you are located.
     
  6. AFF888

    AFF888 Bobtail Member

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    Jan 8, 2018
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    Did yours completely stop working? I'm in ND.
     
  7. bad-luck

    bad-luck Road Train Member

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    No it worked for speed, but the miles stopped turning over
     
  8. bad-luck

    bad-luck Road Train Member

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    Ok, here is a speedometer repair show in Lancaster Pa. You could ship it to them, not sure you want to go that route because it is cracked. Screenshot_20220128-063348_Chrome.jpg
     
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