No, you won’t need Steam VR and I don’t think the G2 even runs with it but I could be wrong. When you plug in the G2 and power it up, WMR should launch automatically (start if if not). WMR is the interface between the G2 and whatever game/sim you want use in VR. SteamVR is another version of WMR (they do the same thing but are made by different folks, with WMR obviously from Microsoft and SteamVR from that developer)
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