Help to install LiFePo4 and ArgoFet 200-3.

[Dr.Blind]

I have a Bavaria 42AC Sailboat from 2001.

Thought this would be straight forward, but I got unsecure and therefore I want to ask before I do something wrong.

I just bought 2 x 100AH LiFePo4 batteries with BMS 100A and a Argofet 200 -3. Would like to replace the old Lead Acid batteries.

The equipment i my boat from before is a:
Multi battery isolator model 702.
Mobitronic Type 925--012A Charger.

And a standard VP alternator.

Should i remove the old Battery Isolator?
The cabel nr 1 from the isolator goes down to the starter, and nr2 goes to the old start battery.

Can anyone help me whit how I should connect the ArgoFet 200 - 3


Thank you.