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Synchronize 4 Motor Lift
Need help synchronizing four 12 VDC motor lift using Gama Inc controller

I built a 4 post screw drive lift using 90 watt DC gear motors and a Gama Inc. 4 channel controller. Currently, I have no feedback or encoder to synch motor positions. The controller is 80 amp total, 20 amp per motor.

The travel is about 2-3 feet both up and down.

Looking for encoders and controller to operate this system in outdoor environment.