Below is a list of links to wiring diagrams that may be of interest, especially to builders using the SDS EFI/EI system.
My wiring strategy departs somewhat from the SDS recommendations in that I use a single switches to control the fuel pumps, the ECUs and the coil packs. However I have offset the potential risk of single switch failure by using Honeywell Mil-Spec switches which are decidedly overkill. These switches are “Lever Lock” which means they cannot be accidently moved if bumped.
The wiring diagrams also assume integration with a Garmin G3X avionics package although the concepts may be transferable to other avionics manufactures.