I started with a EFEL engine with fuel injection which makes the process easier as I have read, because you don’t have to convert to EFI.
I’m using the stock fuel pump with a FPR set to 41PSI T’d off the feed line to the fuel rail and then to the regulator being the return.
In the photo, the plug that has the tape covering is plugged into the stock relay box in the engine bay for the EF-EL. On the plug the BLK/WHT which controls the fuel pump and the BLK/YEL which is a switched 12V wire.
The middle plug on the EJDE has the three wires for powering the ECU, the wire for switching the fuel pump and the tacho, speed sensor and check engine light wires.
Pins 9 and 10 are BLK/YEL wires and need to be connected to Switched 12V. Pin 8 is a BLK/ORA wire which needs to be connected to a constant 12V, constant 12V can be found on the ignition switch, use a multimeter and gently probe each of the connections until you found the constant 12V.
Also on the middle plug. Pin 53 which is a YEL/BLK wire, and it powers the check engine light, I forget exactly what wire I used for my L500 loom.
Using Pin 53 as a reference you can find Pin 28 and Pin 27.
Pin 28, is a BLK wire with a silver dot, and powers the radiator fan relay. I connected this to a solid black on my Mira loom.
Pin 27 is the fuel pump switch wire, I wired this to the BLK/WHT wire on the fuse box plug.
In the green plug on the EJDE engine loom, the solid white wire and the BLK/YEL power the coils and injectors and these need to be connected to switched 12v.
Pin 29 which is a RED/YEL wire can be used as a tachometer reading, I wired this to my apexi rsm. Pin 30 right next to it, which is a BLU/RED wire is for the speed sensor, I might give a go at wiring this to the reed sensor on the back of my EF-EL cluster as I have a intermittent check engine light.