ECU Master Rotary Switch The 8-step ECU Master Rotary switch can be used to control various ECU functions such as Traction Control and Boost Control settings. Installation is simple: connect 5V power, sensor ground, and output signal. The rotary switches can be connected to any available analog input on the EMU, EMU Black, or PMU16. Dimensions: Mounting hole size: 8.8 mm to 9 mm (8.8 mm thread outer diameter) Position pins for fixed mounting position: 3 mm (W) x 0.60 mm (Thickness) Distance from mounting hole center to position pin: ~8 mm Board size: 22.75 mm x 21.15 mm Depth from mounting surface to back of the board: 12 mm (including space for solder pins) Knob: 16 mm (L) x 15 mm (Outer diameter) Total height from solder pins on the back of the board to the top of the knob: ~32 mm