Trying to get info on converting 10pin boat harness to 14pin engine harness. Looking to upgrade to Merc 525’s that have the 14pin harness. My boat side has the 10pin harness. Do I just need the AGI boxes to convert the digital signal to analogue so my gauges work? Or is there more it than just installing AGI boxes? TIA Part #’s to what I would need be a bonus!