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Update:
After replacing the ECT sensor (which was definitely bad), the techs thought the sending unit was bad because the gauge was still pegged out. They removed the dash cluster and found out that there are a bunch of fried wires where someone had gone in and tried to solder something. They say I need to replace a wiring harness. They can't order just that part unless they order the whole dash assembly ($800). So they told me to come down so they can show me what part is needed and I can go and find the part used and they will splice it in.
They said the sending unit still may be needed due to the fact the needle has been pegged out, but won't be able to tell until the wiring is fixed.
I'm going to take a pic of the harness and post it in case I can't find it at the junkyard and may need to find it from someone on here.
The good news is that the tech was fully aware of the HG issues with the Legend, and described in detail exactly what I've seen on here, and says that mine shows none of the symptoms, but I definitely need the gauge fixed so I can monitor the temp.
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