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Jack. The 49-51 Shop Manual electrical layout shows two temp units. The passenger side is a single terminal, (gives the signal for engine temp) and the drivers side has two terminals. This one is a switch that opens to break the circuit, thus causing the temp gauge to read full hot. A cross over wire connects the units, and the second terminal on the drivers side has a wire that connects to the temp gauge. The system is designed to read HOT if the circuit becomes disconnected, thus failsafe to a degree. No pun intended.