EDIT: changed the layout and moved to mini rocker switches. Print face down for a nice finish then glue in a custom text plate and spray paint.

This replaces one of the blanks in the dash so you can add 2 toggles and a button. I wired mine to override fan control for either fan and the button to active my ECU's log function.

You will probably have to resize the holes for your specific switches. Note: Use ABS, not PLA. The interior temps will deform PLA.