This would be a perfect application for an Alternating & Duplexing Relay. An Alternating relay would switch from one pump/well to the other every other required pump time. A Duplexing Relay works like an alternating relay but with the additional ability to bring on the second pump when necessary during high usage applications.
Here's the spec sheet.
Price on-line is about $75-80 dollars, but I bought a box of 100 new relays from a going out of business sale, I can provide you as many as you might need for $10 each + USPS.