Hey Mischelle==It is great sat this temp. If you want you can have a manual gauge installed temp to see if the electrical gauge is correct. The vibration is the rotors or possible the rear drums. Either one can be turned to get rid of it. GoodluckJoe
Most likely a bad sensor/relay
We replaced the temperature gauge in my 1991 Chevy blazer what is the normal operating temp?
220.
210 to 220 is a safe range.
195 degrees F
220 is not excessive
on the side of the radiator
1990 Chevrolet Lumina temperature sender is located on the back side of the thermostat housing. The sender has a wire that goes to the temperature gauge.
Bad temperature sending unit? Bad gauge?
I believe they should run at abt. 200-210 with a 195 thermostat . It will also depend on what engine you have. 4.3 liters run on the gauge right at 200
you can buy the gauge at any auto store or even walmart and there are directions with the gauge.
Buy a new Speedometer cluster. The external Temp gauge is extremely rare