right, everything you should need to know is here (assuming your outboard is compatible, which i think it is)
you will definitely need the engine cable- (note what i said earlier, if you are stuck phone clyde outboard services and ask for Cameron, he has already had to do this for me. you will need the adapter updated to v2.9, no other version will work. as you have a lowrance you can actually do it yourself i think, but best getting it right from the get go from sooz. for reference my dealer told me it comes from sooz with 2.8, it was actually 2.7 it arrived with...both equally as useless.
Suzuki Engine Interface Smis 2.8.0 (990C0-88148-000)
i suspect you will also need this cable- Suzuki Outboard SMIS Basic Components "K8 Adapter" (990C0-88141) | eBay
you will also need a network starter kit that you already have a price for.
i paid about 150 quid all up for my kit 8 weeks ago FYI in the UK. All my analog gauges still work, all i have left to do is rig up a basic loom to get my trim working over NMEA.
sorry i can't give you specifics as i don't have lowrance, but it is all pukka on my garmins. if you need more help then the hull truth thread is superb if somewhat long reading.
hope that helps.