Yes you can do this, without interfering with the analogue gauge.
You will need:
- a NMEA2000 network starter kit
- a Suzuki engine interface cable, running the latest version software V 3.5.0
- an adapter cable to connect the interface cable to the SDS (disgnostic port) on the engine.
The GO7 will then connect to the engine via the N2K network.
Hardest part of the job is running the interface cable from the engine back thru the rigging tube to the boat.
For more details, go to this thread and see the very first post where I provided an info paper that tells ou in detail how to do it: Suzuki NMEA 2000 newtork + standard Suzuki gauges - it can be done