HI THERE EVERYBODY.
I CURRENTLY HAVE A 66 FAIRLANE 4DR DONOR CAR . IT IS A REGULAR 500 WITH THE 289. I WENT TO PULL THE INSTRUMENT CLUSTER OUT AND THE WIRING HARNESS DOES NOT HAVE A PLUG THAT UNSNAPS FROM THE MAIN HARNESS UNDER THE DASH YOU HAVE TO REMOVE ALL THE LIGHTS AND PLUGS AND LEAVE THEM IN THE DASH. IT DOSEN'T LOOK TO HAVE BEEN ALTERED IN ANYWAY IT ALL LOOKS LIKE THE ORIGINAL FACTORY TAPE .I HAVE OVER THE YEARS PROBABLY PULLED 20 OF THESE THINGS AND HAVE NEVER SEEN THIS. I HAVE A 66 AND A 67 BOTH 500S AND THEY BOTH UNPLUG AND THE HARNESS IS STILL INTACT ON THE CLUSTER. THIS DONAR 66 IS A 3RD OWNER CAR AND I SPOKE TO BOTH PREVIOUS OWNERS AND THEY HAVE NO MEMORY OF THE CLUSTER EVER BEING PULLED. ALSO IN THE TRUNK WAS A BUNCH OF PARTS FROM ANOTHER 66 AND SO HAPPENS THERE IS ANOTHER COMPLETE HARNESS WITH FUSE BOX AND EVERYTHING AND IT IS THE SAME WAY. THE CLUSTER WIRING IS MADE INTO THE MAIN HARNESS. MAYBE THESE WERE SOME OR THE FIRST RUNS ON THE 66 AND THEY LATER INSTALLED THE TYPE THAT YOU COULD UNPLUG AND LEAVE ON THE CLUSTERS FOR EASIER REMOVAL. IF ANYONE OUT THERE HAS EVER SEEN OR HEARD OF ONE OF THESE PLEASE GIVE ME A REPLY.
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DWIGHT STEELFINATTIC

I have run across that type of wiring back in the 60's. I use to work in a "Full Service" gas station with a Mechanic on Duty...Remember those? Full tank of gas, windshield wash, oil & tires checked...even got stamps all for about $5! Anyway, i remember pulling everything out of the cluster on quite a few cars. For the life of me I can't remember which ones. Boy, this getting old isn't for wimps!
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1966 500XL 390 C6 Mostly stock at the moment.

It's an early vs. late production thing. Mid 1966 there was a change to the plug-in type cluster.

Sounds like my '65 Mustang cluster.
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Larry Hampton
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'63 Fairlane 2-dr post. Race car since at least '67. In the process of turning it into a proto-clone Nostalgia Super Stock car with FE power and three pedals.