making sense of dash cluster connector measurements
What I would do is post a good clear photo of the front and rear of the cluster on here. That will give you what amounts to a "diagram" of the cluster.
Also, doesn't the manual show the function of the wires at the connector, regardless of color?
You can figure out what some of them are from this by tracing them back
http://www.mymopar.com/downloads/1964/64DartA.jpg
http://www.mymopar.com/downloads/1964/64DartB.jpg
Tan, Light Green are the dash turn signal indicators
Gray is oil pressure light/ sender
Dark blue is "ignition run" and is likely what is powering the gauge IVR which might be inside the fuel gauge.......See if yours has 3 terminals
Red is high beam indicator
Orange is ALWAYS dash dimmer controlled lighting
Violet is temp sender
Black I THINK is "accessory power"
Light blue is fuel tank sender