Hey New,
These things are a mess. I can't really describe what the plug looks like except it is white in mine. I followed the wires from the dash/fuel gauge unit to the first plug and this is it. Like I said, when I looked at it , it looked fine, but when I looked closer, there was a bent over tab inside. It was hard to see without a light. I reached inside the plug with some hemostats and was able to bend the tab back and then snap the plug back together. I wouldn't doubt if this was the problem with your speedo too. Tabs like this get bent when workers are rushed to get things done quickly. If all else fails, just start checking any plug you can get to. It is probably quicker and cheaper to do this than trying to contact warranty service. That was a nightmare! In all fairness though, once I got this little beast operating correctly, it has done very well.