Rheostat switch for single speed blower motors. This switch can be used with our 24A1898-N heaters. The switch turns on and allows adjustment of fan speed from full speed to slower in a clockwise direction. Also used as panel dimmer for Triumph TR6. Part number 78405-knob  will fit this switch and is sold separately.

This is also the panel dimmer switch for MG Midgets from Aug of 1972 onward.