Apexi RSM Rev Speed Limiter

I was looking at an instruction on how to connect the Apexi RSM unit. IT has 2 options, either cut the speed limiter wire or NOT cut it (just splice it in)...What's the different between these two diagrams? Can someone tell me this if they have an APEXI RSM in the car?

I was planning on getting one too and was looking at the instructions, I know what youre talking about. You should cut the speed limiter, why would you not. Once you do that you're able to turn the limiter on and off with the RSM. The more important thing is, which ECU diagram do you use. I see you have an EJ8 like me, but I dont see that model on the list, did you have this problem?

anyone know?