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How to connect ground - Orion-Tr Smart 12/12-18 and BMV-702?

I am installing an Orion-Tr smart 12/12-18 between a Start lead battery and Lithium battery to charge my Lithium in controlled way when the motor and generator is running.

Looking at the install instructions, the ground is connected only via the Orion.

I also have a BMV-702 monitor and to be able to get the voltage from Start battery correct I need to connect the Load shunt side to the Start battery minus. This result in shortcutting the Orion ground pins and I wonder if that is OK? See below image where the dashed connection marked with a “?” is my question if that is ok to connect.


BMV Battery Monitororion-tr smart
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