Yamaha DT80 Help?!

Hello, I’ve been in the process of restoring a Yamaha DT80 LC2 for a few weeks. I bought a new wire harness because the old one was no longer “complete”. Now a green-red cable hangs out of the strand over the carburettor. It leads to the temperature indicator on the speedometer. Unfortunately, I have no idea where to connect the other end (4mm flat plug). Thank you very much.