I know that page don't worry

But he's saying you need to connect the VTEC solenoid on pin A4 and A26 but there's only 1 wire on the VTEC solenoid. And D4 and D22 for the oil pressure switch but where do you connect the wire for D22 since there's already a wire in there? Do you just splice the wire and connect it there? I've read somewhere else that you can just ground that wire somewhere is that true?