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Intermittent wipers didn't appear as a Mustang option until 1970, but thanks to Mustangs Plus, you can add them to your '65-'73 Mustang. The interval Wiper Kit is easy to install- almost as simple as changing the wiper switch. There's no complicated wiring, just a switch and microprocessor combo designed to fit in place of the original wiper switch. Operation is simple: turn clockwise to "On" to get the wipers started. Keep rolling the switch clockwise to decrease wiper frequency and counterclockwise to increase.