System voltage is applied to the temperature sensor, which is a variable resistor that limits more or less system voltage to pass based on engine coolant temperature. The temperature guage needle then moves accordingly to the varying input voltage sent to it from the sensor.
coolant temp sensor,does just what it says,it relays your coolant temp to gauges!
fuses, How come there is no fuse for this in the fuse box. There is one for instrument illumination, but none for insrument operation?
Fuel, Temp, and Speedometer
You can get gauges with instructions at auto parts stores Oil Pressure, engine temp, amps or volts
One of the gauges is outside the safe range. Check oil pressure, coolant temp, and battery voltage.
My older Blazer has a 'check engine' light and also a 'check gauges' light. When the 'check gauges' light is on, check your other gauges like the temp and volt gauges. One of them may be showing something different than normal.
Bad ground somewhere
195 to 210 degrees is the normal safe range.
the gauges move in the first place bacause of air pressure/temp so when u shut off your car the pressure is released because the gauges would break more frequently otherwise.
195
fuse block by park brake. check for bab fuse first.
It would be a dashbaord that displays the speed, temp, etc in digital numbers. It would not have analog gauges.