Hi Paul I used the red plastic capped breather as the fill orifice , and VERY VERY carefully made sure it was brimmed to that level. I initially filled using a funnel and plastic tubing , but found I was getting false 'its full' messages by leaks and dribbles. So I put the last 1/4 pint in using a small syringe and peering in with a torch so I could actually see the level - it helps Red line is actually bright dayglo red. This took an extra 15 mins or so but I felt better about having done it. I dont think you could do this from below - I had all the seat panels out to get full access.
