Is My Coolant Temperature OK ?

Old Fogey UK
Old Fogey UK Expert Adviser

I went out yesterday for my first post winter drive in my '34 Hudson 8.

I have just fitted a temperature gauge and looking at it yesterday (air temperature about 48F - 50F) after a 20 mile run the gauge was registering a tiny bit under 150F.

Is this normal or is it time to use Thermocure ?