Steve,
After being given a few pointers from others I found mine under the dash it was a bit of a hunt though. Its Yellow Black and folded back on itself and then tiwrapped into the middle of the thick loom behind the gauges. The good thing is from those that have hunted before they are all found in a similar place.
I cut off the existing four or five tiwraps behind the oil and water gauges going back toward the right (rev counter) and teased the loom apart and there it was.
Replaced the tiwraps and I was sorted, took about an hour though and not very comfortable a good torch inspection light is a must ❗