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If you want the line to taper, you can set your brush tool to a degree of softness and size, then stroke your line with simulate pressure. Then ctl/cmd click the thumbnail and add the gradient.

The line will be fat in the middle and taper at each side, so you can cut this in half (I'd use the square marguee tool), then duplicate your result, transform (flip horizontal) and move to the other position. OR, use a radial gradient, cut in half and move the pieces.

If there is one way to do something in Photoshop, there are two ways or three ways, etc.!