https://docs.emtronaustralia.com.au/engine-management/reference/aux-output-notes/index.htmlEmtron ECU systems have a high number auxiliary outputs on all products offered in addition to being able to utilize unused fuel and ignition channels as additional outputs. These extra outputs can be used for various functions such as solenoid control, relay control (fans, fuel pumps, etc), PWM systems, and more. Keeping with the concept of Emtron flexibility, the Aux Outputs match these needs. Regardless of this added flexibility, careful planning for best output use is still necessary.Hugoen-us