but that's good to know not to use WD40
Speedometer Gauge Jumping
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Junior User
Joined: Oct 2012
Posts: 62
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From: Somewhere Down in Texas
Speedometer Gauge Jumping
Once, when I removed the gauge cluster from my 1979 F100, I had to remove the speedometer cable from the back of the cluster. When I put the gauges back in, the speedometer needle now jumps around until the truck speed is about 35 MPH, then it becomes still and reads the current speed just fine. So why is it not reading correctly? The cable is good, but when my boss looked at it, he thought that it may not be fully connected at the back of the cluster or at the side of the transmission. Any suggestions?
Cargo Master
Joined: Apr 2009
Posts: 3,038
Likes: 4
From: South west Idaho
After removing mine in my 73 i never got it fully connected and that,s what mine did. They are a little hard for me to do because of not having a lot of grip . Grip the locking device and push in hard , after releasing it, pull out on it ,if it stays it's good.__
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Junior User
Joined: Oct 2012
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From: Somewhere Down in Texas
You're talking about at the back of the gauge cluster, right?
Post Fiend
Joined: Mar 2011
Posts: 8,501
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From: Lynchburg, VA
Sounds like your speedo cable is encountering a bit of friction. Don't use WD-40 or anything like that, it'll just ruin the cable. Go to the autoparts store and get you a little thing of graphite oil.
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Junior User
Joined: Oct 2012
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From: Somewhere Down in Texas
I apologize for my inexperience, but what is graphite oil? And how do you use/apply it?
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Cargo Master
Joined: Apr 2009
Posts: 3,038
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From: South west Idaho
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Yes and use a little graphite as was suggested if it's still hard to lock in. Sorry i never made that clear .__
Yes and use a little graphite as was suggested if it's still hard to lock in. Sorry i never made that clear .__
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