I have a large one and a small one. The large one was required to pass the EFII harness connectors through. I separated the EGT/CHT wires to the small one, as was recommended by Garmin.
I now have a System 32 EFII harness which includes bulkhead connectors so I really did not require the large pass through, 2-1" pass throughs would have been sufficient.
Aerospace Engineer '88
Structure - 90% Done
Cabin Top - Aaarrghhh...
EFII System 32 - Done
290 HP Barrett Hung
ShowPlanes Cowl with Skybolts Fitted - Beautiful
Dues Paid 2018,...Thanks DR+