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Discussion Starter #1
The speedometer on my 69 GTV has started to act up. The needle fluctuates wildly at low speeds but then smooth's out at about 40 mph. It seems to be gradually getting worse. Is this likely the speedometer itself wearing, or could it be the speedo cable or even something in the transmission? The car has 90,000 miles. Any thoughts as to what is most likely? The speedo cable is a bit hard to get at lying on your back under the car. Can you repair the speedometer yourself? Any thoughts would be appreciated
 

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Lubricate your cable

Go to the local NAPA store and find some speedometer cable lubricant. Loosen the cable sheathe by unscrewing it off the back side (under the dash) of the speedometer. It is the highest point in the system, so just squirt the lubricant into the sheath around the cable and it will work its way down to the other end. Before putting the cable and sheathe back onto the back of the speedo head, check by twisting the end of the cable inside the sheathe between your fingers to verify that the other end is still caught by the drive. If not (and it probably won't be if you have pulled the cable out a bit) then at least be sure the square end of the cable is in the center squared location on the speedo head and fit the sheath on and screw it back onto the head all the way. Then go to the rear of the tranny and unscrew the drive end of the sheathe. You must be sure the cable is in the square end of the speedo drive. You should already have checked to verify that the speedo still shows movement on its face if you twirl the cable end. Don't worry so much that it might come out of the head when you do this since you have a shoulder on the top end which will not let it back out if you have it already screwed tight. Piece of cake!
 
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