My '93 Taurus had a temp gauge that worked, it had a scale of a line for Cold, another line that was about 140F, then N-O-R-M-A-L and a hot line. People would ask what is the temp suppose to be per letter?
Ford dropped that in the mid 90's for the Taurus for a dumb one that would not show you over heating until it's too late and the sensor went out of range. This seems to be the norm for manufactures today.
Cars today should have digital readouts of the sensors already on the car instead of stupid gauges that don't report accurately what the sensor sees.