To my knowledge, that's all you have to do. That kit looks complete and will most likely make wiring the engine much simplier. I would consider emaling or calling them (locash) and tell them specifically what you want to (D16Z6 inot a DX CRX) and they can tell you probably better than I can exactly what needs done (I've never actually done one myself, just helped others). I'd imagine that you need to add wires and plugs for the addition injectors to the engine side of the harness and you will probably have to continue those wires after the disconnects between the engine and in-car harness down to the ECU (I don't know if your car is already wired for 4 injectors but they only use 2 or if the in-car harness is only wired for 2 injectors as well). It looks like the adaptor harness and the extra addon harnesses allow you to just plug the ECU in and plug the addon harness and just run the wires through the firewall and plug them into the engine where they need to go (specifically the O2 sensor and VTEC controls). The other harness lets you just plug the D16Z6's distrubtor into the CRX's engine wiring harness and work properly.