what is the proper way to fill #3 drives? thanks

Same as a bravo, pump in through the bottom until it comes out at the top. I just fill to the vent in mine, don't put any in the expansion reservoir in the transom assembly

Btw they take 2.5 GALLONS of fluid each

It will expand enough to show in the site glass on the inner transom assembly ?

Supposed to.

This year, I plan to add a bravo style reservoir to mine. I am going to put a nipple fitting on the inner transom plate, where the current breather vent is, and plumb it to the reservoir bottle. I am sick of guessing if i have enough oil in the drives or not.

You have a sight glass on the transom assembly that you can see ?

I do but I don't put any fluid in there. Read too many times about it puking out. I just crack the top plug and make sure clean fluid starts to come out once a week.

[ATTACH=CONFIG]534741[/ATTACH] i have res on 3 drive and i also have retro fitted res on tail stocks