How fast is the engine running and hard is the engine working? If it's running at full speed on with a load like a feed grinder or pushing heavy snow, it should be throwing plenty of heat out the radiator. If it's only idling with very light loads and the cab heater is set on high it could have trouble reaching operating temperature. Are you using a block heater to warm the engine before starting it?
If the coolant level is good and it's working hard enough to throw heat out the radiator, it does sound like a thermostat could be stuck open. An easy way to test the old thermostats or new ones is to dunk them in boiling water and watch them open and close properly. If they are OK I'd check the gauge next.
Anything is possible on a 40 year old machine, check the simple/inexpensive things first.
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Today's Featured Article - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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