Jumpy tach and speedo question
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Cruisin'
Joined: Jul 2002
Posts: 9
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From: Louisville, KY
Jumpy tach and speedo question
I think I remember having a jumpy tach and speedo (just jumps a little off the peg, in time- jump, jump, jump, etc...) once upon a time in an SC. The '81 I am going to pick up next week has the same issue. I think I remember it being a vaccum leak or maybe something more costly like an alternator. Does this sound like anything you guys have experienced? Thanks in advance!!!
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Joined: Feb 2004
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From: SW Ontario canada
IME, the only time the tach and speedo get jumpy is whent the voltage is very low. I suggest you check the voltage in the system with engine off and engine running to check the alternator/battery function.
The Ancient One
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From: Los Angeles, CA
I've heard there is a damper circuit in the tach that when it fails can cause a jumpy needle, but htis wouldn't have anything to do with the speedo.
Check for good ground connections as these cars use a series connection (my 84 does anyway) to provide ground from one gauge to the next.
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Check for good ground connections as these cars use a series connection (my 84 does anyway) to provide ground from one gauge to the next.
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