Pump water pressure sensor with arduino

Sir
I am new member here and I looking about this idea
I need to change the water pump mechanical pressure controller to arduino by using pressure sensor with analog output and I program the arduino to start and stop the pump at specific setting mentioned in the program.

Is this idea easy to do?

Thanks

Yes. Pick a suitable pressure sensor and motor controller and come back if you have specific questions.

I think this type of pressure sensor is Ok

http://www.ebay.com/itm/221866934376?_trksid=p2060353.m1431.l2649&ssPageName=STRK%3AMEBIDX%3AIT

but, now is it possible to program the mille ampere in the analog input and configure it as a digital output to start & stop the motor?

Yes, you can read the 4-20 mA sensor output using a 200 Ohm resistor to generate a voltage.

What pump and pump controller do you intend to use?

The pump is CALPIDA 2 hp, but why I need pump controller? The arduino can not generate digital output to start and stop the pump by relay as example

A relay can be a "pump controller", but an Arduino cannot directly control most relays, or any pump.

An Arduino can directly control many types of Solid State Relay (SSR), which in turn can switch a 2 HP pump.

Many Thanks sir