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So I got under there and took the plug out of the diff (was safety-wired!) and cut the wire up inside the storage compartment, and then replaced that section of wire (I voted it "Most Likely to Have A Break In It") with some test-lead wire.
At first I thought I had it, the speedo worked, but then it didn't, and it started acting the same old way (jumping around, then suddenly working after a hard turn or hard brake, or just in the middle of a drive with no real provocation).
So now what?
I already tightened the three connectors at the back of the speedo, and have reached up behind there at speed (not easy) and tried to affect it with no success.
I find it hard to believe the the run of wire from the back of the car to the front could have a break, since it's in a protected tube with lots of other wires that aren't broken.
The only things I can think of are:
1) Tighten the connectors on the diff plug, which I didn't do because I was afraid of breaking that little grey plug-case in the cold.
2) Solder the connections onto the back of the speedo.
3) Find a ground somewhere that only affects the speedo and nothing else in the gauge area, and fix it.
4) Replace speedo ass'y.
Anything else?
5) Get another car, is rising with a bullet right now....&^)
Thanks, as always.
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