While most compressors use compressor pressure switches for the normal on and off operation of the unit, there are some that are manual or multi-functional. In many cases, these are very hard to find, so you have a choice. You can get a multi-function switch that will be able to do all of the above, as well as holding a level on your vehicle. This will help you if you have a trailer or a small off road vehicle that is going to be attached to the vehicle, and you want to adjust the air level, with a push of a button on the compressors pressure switch.
However, if you are looking for something more than a simple on and off type of switch, there are some compressors that do have a valve control valve, on them, so that you can actually turn on the air that is flowing through the pump. The valve control valve comes in both single valve and double valve varieties. The reason for this is that there are two different types of valves, and some people like to have the ability to have the pump on or off, depending on what they need it for. Most people like to have a dual valve for pumping air into the system for heating or air conditioning.
So in conclusion, whether you are looking for a valve control switch, or a multi-function compressor, there are plenty of options out there. The benefit is that they are easy to find, and generally cheaper than purchasing a new compressor, because they are less expensive. Make sure you make your decision based on your needs and not on price alone.