Factors to consider in selecting the best EG product for your particular application:

Application
Wastewater/Pump Down
Freshwater/Pump Up
Process Control

Size and Requirements of your Equipment
Simplex to Multiplex
From Fractional up to 1000 HP

Type of Control System
Relay Logic Control
Solid State Control
Programmable Logic Control

Type of Sensor 
Floats
Bubbler Transducer
Pressure Switch
Submerged Transducer (4-20mA)
Ultrasonic