1998 cobra cluster issues

GTCobra407

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So, our Cobra has a issue with the cluster. The speedo jumps at low speeds but is smooth at high speeds. I believe it has 3.55 gears. Is this a VSS issue or speedo gear?

The other issue is the fuel guage isn't working properly. It's stuck between 3/4 and full. Where would I start to see if it's a voltage signal or a issue with the float ?
 

cobrajeff96

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This might help a bit (attached).

A jumping speedo could be an indication that an aftermarket module might be in place, like a Dakota Digital. Sometimes both my tach and speedo twitch but then go back to normal. Both are driven by aftermarket modules.

Also, be sure to visit accutach.com

Mark Olson is like a national treasure in the Mustang community and runs that site.
 

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GTCobra407

GTCobra407

New Member
Joined
Feb 2, 2025
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This might help a bit (attached).

A jumping speedo could be an indication that an aftermarket module might be in place, like a Dakota Digital. Sometimes both my tach and speedo twitch but then go back to normal. Both are driven by aftermarket modules.

Also, be sure to visit accutach.com

Mark Olson is like a national treasure in the Mustang community and runs that site.
Sweet thanks
 

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