How do you know for sure the compressor is bad in a 97 tacoma for the air conditioning?

If you put a set of gages on the low and high side it will tell you the pressure reading, if the compressor is bad the pressure will stay the same, for instance at 70 degrees Fahrenheit the two gages will read about 70 pound per square inch. Normally the compressor would read on a good compressor low side 30 to 30 PSI and high side 275 to 325PSI high side with the temperature inside the center vent max AC fan on high using R134A would read 34 degrees out the center of the console. If there is no refrigerant then it would not build up pressure, and if that was the case you would bypass the low pressure switch to make the compressor come on to see if it worked and would add some refrigerant to see if the pressure would rise on the high side. but inf the low side started to rise that would mean the compressor has no suction thus telling you the compressor is bad. If you put a set of gages on the low and high side it will tell you the pressure reading, if the compressor is bad the pressure will stay the same, for instance at 70 degrees Fahrenheit the two gages will read about 70 pound per square inch. Normally the compressor would read on a good compressor low side 30 to 30 PSI and high side 275 to 325PSI high side with the temperature inside the center vent max AC fan on high using R134A would read 34 degrees out the center of the console. If there is no refrigerant then it would not build up pressure, and if that was the case you would bypass the low pressure switch to make the compressor come on to see if it worked and would add some refrigerant to see if the pressure would rise on the high side. but inf the low side started to rise that would mean the compressor has no suction thus telling you the compressor is bad.