You don't need the safety cable for the mp pumps as the smarts (relay)are built into the ecotech controller Tunze pumps don't that is why u need safety cable.
That's an expensive way to do it as the vortech controller has the relay built in u only need the ecotech cable which is cheap cut it in half to do 2 pumps then any 12v battery and charger the safety conectors are for Tunze pumps that don't have a relay
Adrian
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