I would leave the fuse in line. I think the Zumo fuse is a 5 ampere whereas your lighter fuse is a 25 ampere (i think). If you have anything going on with your Zumo, better to let the 5 ampere take the hit.
Actually, it's a 2 amp with the Zumo. One problem I ran into was that the fuse assembly will not fit through the hole in the fairing where the hydraulic clutch line goes. I had to cut out the in line fuse and then splice it back in again on the other side of the fairing.
It's operating fine and I just have to put the fairing back on and tie up and hide the extra audio cable wire now. It takes several minutes for it to find my mp3 music, so I'm going to have to do something to speed that up. I assume that it's searching through the first 1000 songs on the SD card before it plays or something like that. For now, I needed a break and I'll work on getting the software, etc up to date. Thanks for the help gents.