Instrument Cluster Removal

Thanks for the tips. A couple of questions. First the instrument cluster controller. I went to the link and they list two versions. I'm may have overlooked it but I didn't see the 1966 Dodge Dart as applicable for either version of the controller. Any idea which if either works for my car?
also what kind of ballpark price can I expect to pay if I have the voltmeter conversion done for me?
Do you think that cleaning up the speedo cable and lubing it would get my speedo back to reading properly or would I need to replace the gear at the trans or have the speedo it's self rebuilt?