As title says i was digging around down the back of engine from the top changing my oil filter as car been sat over 10 years since i built it and then afterwards i come across this wire as in pics it seperates from the loom just under the brake servo down behind the metering head...now it may have been never plugged in and ive just forgotten since built but im not sure as my temp guage stopped working also which may just be coincidental as (thats all still connected to sender which was new but been sat in coolant for over ten years was working while i flushed old coolant out then stopped) so like i say may be just coincedence so ive ordered new temp sensor anyway...so back to the plug here is a couple of pic..thanks in advance! its the one sat on the inner wing just so you can see length of wire