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Classic Mustangs Tech Forum

Technical discussions specific to 1964-1967, 1968-1970, and 1971-1973 Classic Mustang. Discuss all tech related to in-line six cylinder and V8 powered Vintage Mustangs here.

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Unread 10-06-2011   #1 (permalink)
noma289 is offline Rookie


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Default Clicking Speedometer/Broken Odometer

Recently the speedometer in my 1966 coupe started clicking every second or two depending on the car's speed. The needle goes to the proper speed and stays there until it clicks; when it clicks, the needle jumps 5 mph before going back to where it was. Ever since this happened the odometer has stopped working. I had a new speedometer cable put in 150 miles ago so I've ruled that out of possible problems. Time for a new speedometer/odometer?
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Unread 10-07-2011   #2 (permalink)
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Quote:
Originally Posted by noma289 View Post
Recently the speedometer in my 1966 coupe started clicking every second or two depending on the car's speed. The needle goes to the proper speed and stays there until it clicks; when it clicks, the needle jumps 5 mph before going back to where it was. Ever since this happened the odometer has stopped working. I had a new speedometer cable put in 150 miles ago so I've ruled that out of possible problems. Time for a new speedometer/odometer?
Hi,
Was the ca replaced because you were experiencing this clicking and unstable reading? If I were faced with this, I'd pull the unit out of the car, put it on a work bench, and using an old cable in a drill motor, test the head unit. Then decide to replace.
Are you handy enough to do this?
Good Luck!
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Unread 10-11-2011   #3 (permalink)
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Just a thought -- sounds like your cable is not fully seated. Before doing anything else, unscrew the big nut behind your instrument panel (which holds in your speedo cable). After it's out, jiggle the cable back and forth a few times and make sure the cable's outer housing is not kinked anywhere. (The cable and its outer housing can bind if they're not routed carefully.) Then reinstall, but make sure the square head of the internal cable is fully seated (push it in firmly) inside the housing before you re-secure with the big nut. Good luck.
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