So, reading again , do you have the Reefkeeper ? You'll need the L3 version with 2x power bars & SL1 module .
Configuration will be :
Head unit - at tank
PC4 - plugged into wall at tank
Purchase 6pin tele/data cable long enough to reach sump
PC4 - plugged into wall at sump
SL1 (doesn't matter which order , SL1 then PC4)
Temp prob - included with RKL
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