8. So you're saying the Green/Blue from the ECT somwhere changes to a Blue/Gray at the Instrument Panel? AND that doesn't appear on the Pre or Post 99 Drawiings!
AND if you look closely, unfortunately the colored drawing shows a Gray/Blue wire........That is incorrectly colored and is actually a Gray/Black (Gr/Bl) wire and goes to the Fuel Sender. However, with BOTH drawings there is NO reference to a Blue/Gray (Bu/Gr) wire amongst the 17 Instrument Panel wires?
The ONLY two Blue (main wire color) wires at the Instrument Panel are a Blue/Red = Oil Pressure Light, and, Blue/Black = Hi Beam indicator Light.
I don't have a 5th gen, never have, so I can only go by relevant drawings be they Right or Wrong!! So it's impossible for me to verify this Blue/Gray wire you talk of.
9. Go back and check I added the number 9 to that paragraph this morning to draw attention to it.
"you sound very condescending no reason for that". Short memory mate, and yes I do have reasons. And still no mention that you have replaced the ECT. I hope you fitted a genuine OEM and not some Chinese cheapy!
However, you've got tons of info provided which should hopefully resolve your issue, you just need to use it, along with the Service Manual and wiring diagram.
Info - Wire coding and drawings.. Eg A Bu/Gr - Blue is the Main wire colour, Gray is its stripe being the trace. No trace = a solid color wire. See attached wire table.
AND - I do mean it, Good Luck and hope you have it resolved soon.