Tighten screws. 1978-79 Volkswagen

Disconnect throttle valve switch connector and connect an ohmmeter to throttle valve switch terminals. With switch in idle position, ohmmeter reading should be infinity.
Raise switch roller to full throttle position. Ohmmeter should indicate zero ohms. If correct readings were not obtained, move throttle valve to full throttle position and hold.
Loosen hold-down screws and move switch until ohmmeter changes from infinity to zero ohms. Switch roller should contact center of throttle valve lever. Tighten screws.