need a pressure switch fo 2hp pump

I have a 2hp sears irrigation pump on a sand point well that I use for sprinkling 1 acre. I want to install a pressure switch so that if the power goes out or the pump loses prime (while running) it will shut off power to the pump. It is a 220V., single phase pump. Any ideas on where to get a pressure switch like I need?

If you have the pump I think you have, it's a self priming centrifugal. If so, you will notice it did not come with a pressure switch. There is a good reason for that. If you want to protect it from melt down, use a thermostat. I don't have a picture of them but they are mentioned on my website under motor protection. If the pump get's hot, the thermostat will shut it down before it gets hot enough to do damage.

bob...