One scenario could be that the sending unit for the gauge on the engine is bad. Try to locate it and replace it if it is corroded and check the wiring to it also.
On a 1991 12-valve Cummins engine, the coolant temperature sensor is located on the engine block, near the thermostat housing. It is typically found on the driver's side of the engine, towards the rear, and is screwed into the block. This sensor monitors the engine's coolant temperature and sends the information to the engine control unit or gauge.
In a 1991 Chevrolet Silverado with a 5.7L engine, the temperature gauge sensor is typically located on the engine block, near the thermostat housing. It's often found on the driver's side, threaded into the intake manifold or cylinder head. This sensor sends temperature readings to the gauge on the dashboard, allowing you to monitor the engine's operating temperature. Make sure to consult the vehicle's service manual for the exact location and details.
yes it has both. at least in my 1991 ford ranger does
There is'nt one on the guage cluster but there is on the motor up by the thermostat housing
Check out www.fueleconomy.gov
145hp
We replaced the temperature gauge in my 1991 Chevy blazer what is the normal operating temp?
195 degrees F
My 1992 Spirit does the exact same thing... its either the Coolant Temperature Sensor that screws into the engine or as in my case a faulty Temp Gauge.
i have a 1993 190E - my oil pressure gauge always sits on 3. ==New Answer Haedline == The oil pressure gauge actually moves but is related to several factors Engine Temprature Oil viscosity Engine speed. When you start you car the engine temperature is low the gauge goes to 3, after a long drive/travel and if your temp gets to 80C then with an engine speed of 750-800 RPM you oil pressure gauge will read about 1.5. if you rev. the engine the pressure gauge goes up to 3
Bad oil pressure sending unit?
No , the 2.3 liter four cylinder engine used in a 1991 Ford Ranger is NOT an interference engine ( according to the Gates website , they make timing belts etcetera )