Stopped by my local Orange shop and looked at a new Z. One spade end comes from just above the oil filter, which I knew. The other goes to a six pin (5 wires) connector underneath your left hip. My guess is either an oil pressure safety switch or hour meter but an easy fix.
We're cutting every four days this time of year. The Z has made a 45 minute job into a 20 minute one, nice! D-Con, cats and German Shorthairs don't mix. One of the three will get one of the others.