You have to modify the harness. You can not just swap out the wires for the idiot light wires to the gauges. I have had the harnesses out of the cars side-by-side and they are different. I was able to modify the idiot light harness to be the same as the gauge harness, but the lighting is different and the connections to the gauges are different IIRC. The hardest part was getting the correct lamp holders added in.
Also, I think the gauge cluster is a '65 style cluster with all the metal bulb holders without the plastic loom on the back like the standard '66.
It has been years since I did this, but there was more to it than I had hoped when I started the project.
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"If you do everything you'll win"
-LBJ
13 Smiles per Gallon:
66 Bonneville wagon
66 Bonneville 2d HT - In perpetual progress
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