My feeling with oil line taps is that no-one who has ever forgotten to turn their fuel on or has ever inadvertently turned it off when they weren't intending to should ever fit one without some sort of mechanical or electrical over-ride, and then the result is a non-original looking mess which doesn't belong on a machine purporting to portray a WD motorcycle.

If it's already fitted with a tractor seat and exhaust bandage then I suppose it doesn't matter much