I understand how to wire up the signal for the injectors but as for the negatives, i see on a wiring diagram that they go to "JUNCTION CONN C125".

also, connected to that is the negative for the:

-Purge control
-Elect air control valve
-PGM-FI Main relay

eventually it all ends up connecting to IGP connection A25 on the ecu

before the wire actually reaches the ecu it goes through a "12" little square, not sure if that is a fuse or what.

Basically i'm rewiring all the fuel injection parts to have a cleaner look.

is the "junction conn" just making all the wires touch each other to basically make one ground?