87 to 90 YJ fuel guage sender is: 0 ohms = empty; 44 ohms = 1/2; 88 ohms = full
Perhaps there is an insufficient gas level in the tank?
Your fuel sending unit is not giving the correct reading to your gauge
It would be better to write: My gas gauge reads empty. Note that 'gauge' is singular, so it needs the singular verb, reads. If you had several cars all with gas gauges that read empty, then the verb would be read.
210 deg F, it should be directly verical on the engine temp gauge.
There is a switch under the vehicle near the gas tank that may have something hung in it, like a tree limb...
Then fix it
mechanical
That depends entirely on the vehicle and on how accurate the gauge is.
The gauge or sensor needs to be replaced.
The correct GAUGE wire is 28 for a car stereo.
Fuel level sender (in tank) faulty. If replacement doesn't correct fault, check sender wiring back to instrument for poor connection. Finally, replace gauge.
Either the gauge is broken or the sender is broken.