Thanks both, that’s very very helpful! I’ve been pulling my remaining hair out trying to figure out the wiring!!
The purple wire that has a disintegrated crimp was under the tank in loom coming from the gauges where the purple wire from each gauge joins to one purple wire at a loom junction. From the video and wiring diagram there appears to be another join further along which I’ll check after first checking that there is 12V at the gauge end or not.
That's the single purple wire from fuse #3, and it's broken right where it joins up to a bunch of 4 purple wires (under that bit of blue insulation) exactly as per video post.
Scrap that, I was measuring on the crapped up end, it has 12v and the clocks now on and starting .... whoop! Now I’ve got a shed load of wiring to re-wrap. Thanks for your help guys.
That's the single purple wire from fuse #3, and it's broken right where it joins up to a bunch of 4 purple wires (under that bit of blue insulation) exactly as per video post.