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Old December 1st, 2009, 07:41 PM   1 links from elsewhere to this Post. Click to view. #1
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speedometer bouncing around


I am slowly working down my list of items to fix on my newly aquired project, when I bought this car the speedometer was bouncing around all over the place and making a fast clicking sound like the bait warning on a cheap Zebco fishing reel. I figured no big deal someone probably was working on it one time and never pushed the speedo cable into the back of the dash far enough ( I did that one time and it acted exactly as this one is) So I tore it apart tonight and sure enough it was not pushed all the way in until it clicks firmly in place, so I pushed it all the way in place, drove the car up the road and the clicking stopped but the MPH needle is all over 30 then 80 then 10 then 60 just bouncing all over. I have absolutly no experiance with that. While its apart I am tempted to put some LED's in or something to brighten that dim lit dash.
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Old December 1st, 2009, 08:48 PM   #2
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I have the exact same problem with my car does your do it all the time or when ever it feels like it
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Old December 1st, 2009, 09:11 PM   #3
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re speedo


Mine does it all the time, I cant figure it out at all but I really would like to fix it
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Old December 1st, 2009, 09:16 PM   #4
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Originally Posted by real57vetteguy View Post
Mine does it all the time, I cant figure it out at all but I really would like to fix it
the circuit board behind the cluster tend to short out through a period of time I would replace the whole cluster
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Old December 1st, 2009, 09:17 PM   #5
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you can also go to the ford dealership and find the circuitry for the speedometer and replace the whole thing
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Old December 1st, 2009, 09:23 PM   #6
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Originally Posted by ddarkslayer View Post
the circuit board behind the cluster tend to short out through a period of time I would replace the whole cluster
the circuit board has absolutely nothing to do with a mechanically driven speedo.

try lubing the cable real good. and make sure the gear on the end of the cable is in good condition and seated all the way.
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Old December 1st, 2009, 09:34 PM   #7
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re speedo


If memory serves me correctly there isnt a gear for the upper section, isnt it just a small square type cable that pushes into the back of the cluster until the fitting snaps into place?
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Old December 1st, 2009, 09:45 PM   #8
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its either the cable is stretched and about to break or the teeth on the cable or in the trans are wearing out. Id bet on the cable though
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Old December 2nd, 2009, 01:39 AM   #9
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Originally Posted by 86er View Post
its either the cable is stretched and about to break or the teeth on the cable or in the trans are wearing out. Id bet on the cable though
x2 the circuit board has nothing to do with this issue.. it's a common issue with the age of these cars and you can try to lube the cable but more times then not the shit just eventually brakes and you get no more action from the speedo until you replace teh cable.
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Old December 2nd, 2009, 04:05 PM   #10
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re


I picked up a new speedo cable today, I'm getting ready to install it, while Its apart I really would like to do something about the gauge lights, I'm not into all that glowing neon crap but all the nice bright lighted gauges these days and hop into the mustang and I get the impression that the battery is about to die, I did some searching and the best info I could find is that it is possible to put a 194 LED wide white refractor bulb in the 87-93 dash. Does anyone have any experiance with this?
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Old December 2nd, 2009, 04:16 PM   #11
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Originally Posted by 86er View Post
its either the cable is stretched and about to break or the teeth on the cable or in the trans are wearing out. Id bet on the cable though
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Old December 2nd, 2009, 06:20 PM   #12
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re


Neither, I checked the speedo gear and replaced the cable, it still bounced from 20, 60, 120, 40 etc, then I pulled it back out inspected the back of the speedo, applied a little WD-40 and let it soak, applied WD-40 again then a little lith grease and installed the cable again, the speedo then registered speed somewhat accurate but the needle jumped about 1/16 of an inch realy fast like. I am getting the feeling that the speedo is just worn out and it might be best just to order another gauge cluster.
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Last edited by real57vetteguy; December 2nd, 2009 at 06:23 PM.
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Old December 2nd, 2009, 07:11 PM   #13
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the clusters do break in almost every car, i've had both do it in both of my cars, you can usually find them used if you want to take the chance again
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Old December 3rd, 2009, 09:59 AM   #14
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re


Well from what I have learned, the speedo housings are alluminum, they tend to warp over time from wear and stress and you get bouncing and pinging speedo needles, thats when you bite the bullit and buy a speedo or a cluster, I'm bidding on one on Ebay. Great
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Old December 3rd, 2009, 12:18 PM   #15
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Sometimes you can find them in junkyards as well
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Old December 3rd, 2009, 12:28 PM   #16
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mine always bounced around till i got geared and replaced the speedo gear. The clip that holds the stock one in was broke and it wasnt in there very tight, ziptied the fuck outa the new one and it went away
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Old December 5th, 2009, 10:52 AM   #17
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Re


I found a cluster from a local guy for 15.00 and actually can give you guys a little heads up on how to check if its your cable or the speedo unit thats bad.

After removing the cluster:

1) On the back of the speedo where cable slides in you can spin that with your fingers and watch the speedo needle register speed, if the needle smoothly climbs up to say 10 or 20 mph and returns to 0 when you stop spinning it your speedo is fine, however if the speedo needle shoots all over the place, bounces around, sticks on a certain speed, any of the above its wore out and its time to replace it.

2) Cable, if you grab the cable (assuming its still attached to the tranny) try to spin the cable you should be able to turn it about 1/4 turn and thats it, if it turns more that that the cable has stretched if it keeps turning then you have a broken cable or broken speedo gear down in the tranny.
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Last edited by real57vetteguy; December 5th, 2009 at 10:55 AM.
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Old December 5th, 2009, 11:01 AM   #18
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re Dash lights


I did want to brighten up the dash lights a bit by converting to LED bulbs while it was apart, I searched and searched found a couple tech articles but nothing really solid, so I called Superbrightleds, and a couple other LED places, no one could advise me beyond "uhhhh well its a 194 wedge style bulb" well from there, you can choose from about 5 or 6 different styles so at this point I guess I am putting it back together with the stock bulbs
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Old December 5th, 2009, 01:50 PM   #19
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there is another thread around here that has a few articles and ebay links to the bulbs you need.
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Old September 15th, 2010, 07:16 PM   #20
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jumping speed-0


i have the same prob .. But its not the speed cable .. Its my speed-0 unit .. If i take a electric dril to the speed-0 it will work find if there is no pressure on the back of the unit. When you apply pressure 2 the back of the unit it will start jumping ..
So i went hunting a few yards and only could find 4 banger mustangs . So i bought the Od cluster 4 parts so could do a temp fix .. The speed-0 only reads 85mph .. its so funny .. I took apart the old unit and dropped in the 85 mph head.. It reads the mph right .. But .. 85 is not going to cut it .. I will hit 85 in half a block .. So now im looking 4 a 140mph od cluster or just the speed-0 head unit.

any ideas of where i can look ...
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