The coolant/water temperature gauge incorporates a voltage regulator, which controls both fuel and water gauges.
- If both the water and fuel gauges are off, suspect the regulator
- If only one gauge is incorrect, suspect a bad connection, usually at the sender
See: Fuel Gauge Wiring See: Temperature Gauge Wiring
Temperature Sender at cylinder head (on right side of head, at the very front):
Fuel Level Sender at fuel tank
Voltage Regulator is part of Temperature Gauge
Voltage Regulator Circuit in Cluster Gauge