I have a 1998 dodge 1500 with the 5.9L engine. Engine running hot.
My son has been driving the truck. Today I replaced the water pump and removed the thermostat. The engine still heats up very quickly, like in less than a mile of driving. The temp will actually lower if you let the truck idle. Oil was low so added oil but the oil pressure is still running high. 40 is mid range and it is between 40 and 110.