Cruise control on a ‘66 Valiant

I put one in my '69 Dart 340.

I placed the unit under the dash and ran the push/pull cable to the carb through a cut firewall insulation plug. It's really concealed and is not visible under the factory air cleaner.

That's a great idea!

I also wired a factory 1970 cruise control turn signal switch from a B body for a period correct look.

I have a both a used and NOS turn signal switch just like in your picture. Definitely looks period correct.