Why doesn't my 64 Tbrid temp gauge work?

I'd replace the sending unit , don't use Teflon pipe sealant or tape on the pipe thread a little grease will be fine The gage sound to me is as it should

Thanks guys, I will change both the tstat and the sending unit (they are cheap enough) I'll order from Macs and post my results. Thanks again..

Well, I changed the sensor (no tape, and I checked for continuity between sensor base and battery) and still the gauge does not move?! The cold resistance was 640 ohms, hot it was 64 ohms, and motor was too hot to keep my paws on, so tstat must be good. The 5v wire and clip are good too. I'm thinking its got to be something with guage...unless I'm missing something..

Thanks Js08016. I have the updated "chip" type regulator, not the old wirewound type. It puts out a steady 5vdc. The oil pressure guage and fuel gauge both run off same regulator and both work. I'm thinking its got to be corroded or like, terminals/wiring to/at the temp gauge like you say. Or the gauge is damaged/out of calibration. Anyway, that's my next step to get behind dash and check wiring and connections and guage..when the weather allows....pretty darn cold now lol...