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The coolant temperature gauge is also operated by 2 coils. One coil is directly grounded and the other is grounded through the coolant temperature sending unit. The sending unit has a resistance of 55 ohms at 260°F (127°C) and a resistance of 1400 ohms at 100°F (38°C). As coolant temperature increases, current flow through sending unit and one coil increases, causing pointer to move.