Hi, have all the diagrams, just need the year of the car. Two slightly different circuits. Have you tried your fuse box? Sometimes fuse holders get corroded a bit and stop making contact. Let me know if you want any of the diagrams. Cheers.
My car is a 1964 series IV, if you find one that would be great. I have fixed the temp gauge now but it would be useful to have. Turns out the new sensor was no good so I re fitted an old one and it worked straight away!