After my recent rebuild on my '63 tr4, the temperature sensor now reads 100 deg when warmed up and 40 deg when cold. The temperature sensor resistor reads 880 ohms when warm and 88 ohms when cold. I'm trying to figure out if my sensor is bad, or if the gauge is bad, or if the engine really is running that hot. It seems to run normally, and doesn't overheat, so I'm suspecting the gauge or sensor. Any ideas?