Is there a way to tell the primary injector clips apart from the secondaries? I just got EV14 750s and 2000s, the 2000s have the same as stock however the 750s are different meaning I'll have to solder the new clips on. Only problem is, I'm not certain which is which. I can partially tell only by what reaches what but I'd like to be sure before I do any cutting.

In the picture I have what I THINK to be the secondary plugs, plugged into the injectors and the primary ones are the ones closest. (Or so I think) any way to be sure?

 

Another question, what's this loose connection here next to the oil pressure sender?

 

second picture is the factory water temp sensor for the gauge cluster I believe.

As far as the injector connectors, normally you can tell by where they reach, but it looks like your harness might of been re wrapped/rewired. In which case, the easiest thing to do is just do a continuity check from the injector connectors to the ecu plug. That will give you a 100% guarantee and save you from any guess work

 

If the wires are for primaries it won't matter which wire goes to what injector.The primaries batch fire anyways.
Also if you don't feel like soldering you can get adapter clips that go from stock FD connection to the 725 injectors.You can also get Stock to 2000's if you are running those.(well my Fc connections may differ than the Fd fuel connectors)
I got mine from Turblown.

 

Might look into those adapters, thanks for heads up. My worry is not which primary is which but is separating the primary from the secondary.

 

Personally, I'd just peel a bit of the wrap off the wires and check colours for expediency. If the re-wrap job was any good, primaries should be paired and secondary terminations well separated once the harness is attached to the engine.

In the jap early cars at least, front secondary is light green/white trace, rear secondary is light green - and there is a lhd wire diagram here somewhere.