Garmin sensor kit for Rotax 912/915 iS

The IS engines all have their own sensors inbuilt. Therefore NO NEED to buy sensors. The G3X all get their data from the IS engines CAN bus. Therefore you do need an interface box between the IS engine CAN bus and the G3X.

This box is called a GEA-24 although your Garmin rep will know the best interface for IS engines.

In addition to what Glenn said, you will need a differential type fuel pressure sender.  Most people use the UMA 1EU70D.  This sensor wires directly to the Garmin GEA-24 module, but separately from the Rotax CAN buss which carries the data from the integrated engine sensors.  

Hi, some more information from the Garmin G3X Touch installation manual for you.

You can download the manual here https://static.garmin.com/pumac/190-01115-01_au.pdf

Cheers.