I am not sure which line to cut. They both appear to be the same diameter. I may have to follow the line from the front passenger to the pump location. I am assuming 3/8 line. Correct me if I’m wrong. Since the line will no have a flair, should I just place 2 hone clamps on the tubing? Or are there better ideas. I will use a relay to power a Holly Red. If I install an oil pressure switch, would I also want a bypass switch for priming purposes?