68 Dart Windshield Washer Tank

Did all 1968 Dodge Darts come with manual pump for windshield washer tank? I see they sell reservoirs with electric pump set-ups...is this an aftermarket option. I have an existing tank that is set-up for electric(new). The wire harness has a single wire with cap plug style hanging down...is this for the original motor connection or is this wire for something else...like brake master cylinder warning switch. If they did come with an electric option...how is it activated...pushing the windshield washer knob in? Thanks