Adapting an already-wired harness (s5 to s4)
 

Here's my situation: I bought an E6K, and the harness that came with it is already wired for an S5, but my car is a 87 TII. My question is, which connectors do I have to change to S4 and which can I keep the same?
At the very least I know I have to change the fuel injector plugs over to S4 because I have square top injectors, and possibly the thermostat plug.

Thanks in advance.

dude, just wire in new plugs. easy peasy.