Thanks all, I haven't yet tried all of the repairs that I've been planning, but I have had a new water pump installed about 3 years ago and the radiator was re-cored about 4 years ago.
However, there could very well be a gauge problem. On occasion, I've noticed the temp gauge bounce slightly up and down before settling on one temperature.
I've also had issues with the wires in that area, (choke, temperature sensor) as I've had to replace my water choke coil because it wasn't warming up fast enough on start up and running too rich. (I ordered a new one from England last year and it's been fine since)
1976 230 W115