Answer
You can set a blending mode for the Gradient Overlay…
If the desire is to have the Gradient Overlay be the only color of the type,
you’ll want to set the Fill Opacity
of the Type Layer to 0 (zero) in
the Blending Options
for the layer or via the Layers Panel.
Fill Opacity effects only the actual pixels on a layer…
where as Opacity effects the pixels on a layer and any layer styles associated with that layer.
Attribution
Source : Link , Question Author : user3413128 , Answer Author : Scott