Gauss is a very flexible frame. For survivability you have passive/operator/kinetic plating, and so for mods I would only recommend [Rolling Guard] if you feel like you really need it. Kinetic plating maxes at 100% ability strength and is the only ability that really wants strength so there's not much reason to mod it other than helminth/low level nuke. Balance the rest of the stats however you like.
Notes
This build has different polarities than usual so this may be preferred on a second gauss or make compromises.
Last slot is for energy conversion/fleeting expertise/constitution/flow depending on your preferences (you may have to forma).
Arcanes are up to user.
Keep in mind cost of Mach Rush is halved while Redline is up.
Other Builds