Isuzu rodeo 3.2 V6 engine runing too cold?

Typically, engine operating temperature is around 90 degrees Celsius. However, there may be several temperature sensors, each of which can read the temperature at a different location. Most likely, the gauge is using a different temperature sensor than the ECU is using. Different locations may have different temperatures.

Several possibilities:

• The ECU temperature sensor is reading the temperature at a different point than the gauge on the dashboard and thus the temperature at the different point differs (most likely explanation as the gauge seats on the center)
• ECU temperature sensor is faulty and reports incorrect readings
• Thermostat is old and opens at a different temperature than a new thermostat opens at, but if the gauge is fine, it would require an equal and opposite error to seem fine