The arrows are indicating which wires are part of his 'ground kit', and which bolts, ect. are fastening the kit. In a nutshell, the idea is to go from negative battery cable to chassis ground and from block to chassis ground (the other wires are theoretically redundant, but then again, so is the whole idea if the grounds function properly.), effectively ensuring a proper ground for the battery and all engine mounted accessories. Its cheap, easy, and I've done it to my zx3. It took me half an hour once I got the parts.
ZC #154..Focus Nation..