 Tachometer Anomaly, Pegged at 7K |
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| Ansbacher |
 Aug 5 2015, 06:19 PM
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#1
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Senior Member  Group: Members Posts: 689 Joined: 4-July 14 From: Tampa Bay, Florida Member No.: 17,589  |
Upon turning key on in the Harbor Freight parking lot today, my tach immediately pegged at 7K. Tried key a few more times, same thing. Figured I'd troubleshoot at home, so actually started car to go. Tach jumped around for a second and then settled into normal operation. Has not done it since. Any ideas as to the gremlin that would cause this? First time tach has ever acted up.
Ansbacher |
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| stugray |
Aug 5 2015, 07:46 PM
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#2
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Advanced Member Group: Members Posts: 3,824 Joined: 17-September 09 From: Longmont, CO Member No.: 10,819 Region Association: None |
Probably not related, but MSD 6AL ignitions that have the rev limiter enabled will peg the tach to the value that the rev limiter is set to when you turn on the ignition for about 3 seconds.
It would behave exactly like that if the rev limit was set to 7k. But I'm guessing you would know that if you had a MSD. |
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| Ansbacher |
Aug 5 2015, 08:17 PM
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#3
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Senior Member Group: Members Posts: 689 Joined: 4-July 14 From: Tampa Bay, Florida Member No.: 17,589 |
I am running conventional points type ignition with a centrifugal advance dizzy.
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| 914Sixer |
Aug 5 2015, 08:50 PM
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#4
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914 Guru Group: Members Posts: 8,882 Joined: 17-January 05 From: San Angelo Texas Member No.: 3,457 Region Association: Southwest Region 
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Check the engine harness from the relay board . The wire is black with purple stripe.
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| ConeDodger |
Aug 5 2015, 09:02 PM
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#5
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Apex killer! Group: Members Posts: 23,586 Joined: 31-December 04 From: Tahoe Area Member No.: 3,380 Region Association: Northern California
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Ground. (IMG:style_emoticons/default/chair.gif)
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| porschetub |
Aug 5 2015, 09:06 PM
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#6
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Advanced Member Group: Members Posts: 4,698 Joined: 25-July 15 From: New Zealand Member No.: 18,995 Region Association: None |
x2 exactly the issue,it can be a big old mess behind the gauge holder,best to check in there first,cheers.
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