I would (do) use Yamaha DELUXE seps because they have a sensor built in that can be connected to the standard Yamaha fuel management multi-function gauge. Nice to get a warning BEFORE the engines start missfiring and you don't have to check the sep visually.
http://www.yamaha-motor.com/outboard/accessories/acscitemdetail/5/410/1709/9227/all/2/2325/0/detail.aspx
The above can be ordered online or by phone at quite a discount at: http://www.boats.net/
http://www.yamaha-motor.com/outboard/accessories/acscitemdetail/5/410/1709/9227/all/2/2325/0/detail.aspx
The above can be ordered online or by phone at quite a discount at: http://www.boats.net/