Yes, in most cases you can install a Stages power meter on your Gossamer crankset. Please note, for a time around 2014, FSA used a pinch bolt style interface (Shimano). You need to confirm your crankset is not that type, because a Stages power meter will not fit if so.
Assuming it’s not, then the next step is to determine if your crankset is 386EVO or BB30. If you have a 386EVO, then you can install the Stages Carbon for FSA 386 EVO Power Meter. If it is BB30, you can install the Stages FSA SL-K BB30 Power Meter.
Please note, whenever you are installing a left side power meter crank arm, you need to confirm you have 10mm of clearance between the left crank arm and the chainstay in order for the sensor to clear. Please see the image below.