Finally the safety and convenience of interval wipers for your classic Mustang & Cougar. This switch allows your wipers to work at the maximum speed allowed by your wiper motor with settings up to a maximum 15 second delay. You can rotate the control knob for an almost infinite number of speed settings. Simple to install and no modifications to the stock harness are needed. Retains the stock knob and bezel for the original factory look. Also controls the washer pump.