Been busy with health issues Charlie, but had to jump into this thread for a moment. The E80's and C80's do have a NEMA2000 bus already; called "SeaTalk". If you go back about three years on here, you should find the thread where I installed a Lowrance fuel flow meter on the Jenny B, hooked it up to the C80 Seatalk bus and it worked perfectly using every function as advertised, with one very minor issue; the position readout on the Lowrance meter will flash, but it is as accurate as the E80/C80. Can't get much cheaper either. The flow sensor uses a turbine in the fuel line so if you can put the sensor where it senses total fuel flow it'll be cool. Otherwise you'll need two sensors and two meters. Takes a couple of trips to calibrate tankage levels but after that you'll not be off by much if at all.
Then again, technology moves forward. Some of the newer types might serve your Suzuki's better. Dunno
Don