You never know how the oil filler cap will line up, so why not drill holes in both ends? Be sure to route your safety wire to the nearest practical mounting point. The easier the location is to wire up the easier it is to make last-minute adjustments. Selecting the right length of safety wire will make the job much easier. If the wire is too long and it wraps around the pliers, it'll get tangled; cut it too short, and you'll have to start from scratch. Measuring the distance between the components you want to wire and cutting the wire at three times that length is a good rule of thumb. Next, begin the wire twist at the approximate distance between mounting points. (Note plier position above.) Avoid clamping the pliers onto crossed wires, the result will be a weak point in the wire. Also, when installing or removing safety wire, be sure to pick up all wire scraps that drop to the ground. Sticky race tires have a talent for picking up small objects, and you don't want to get a flat at speed.