After checking the NMEA 0183 sentences that the B&G Hercules 390 supports against the standard NGW-1 Conversion List (v2.420), you will see that the NGW-1 will convert all of them to NMEA 2000 from NMEA 0183 except VPW and VPT.
The PDF you attached describes the sentences supported by the B&G Hercules 390 and what each of these sentences mean. If the VPW and VPT sentences are not essential to you then the NGW-1 will provide a good solution to your needs.
This support article explains in full the conversions that are supported by the NGW-1:
What data will be converted by the NGW-1?
To connect your NGW-1 to your Hercules 390 for converting NMEA 0183 to NMEA 2000, please follow these instructions:
NGW-1 red to Hercules violet
NGW-1 black to Hercules green
To connect your NGW-1 to your Hercules 390 for converting NMEA 2000 to NMEA 0183, please follow these instructions:
NGW-1 white to Hercules orange
NGW-1 blue to Hercules black
Full instructions for connecting the NGW-1 to your devices can be found in the Quick Start Guide that will be included in the box with your NGW-1.
This article also explains the NGW-1 wiring connections:
NGW-1 Wiring Connections