OK you seem to be grand drawing the shape
To get the effect what I done was make a selection with the Pen Tool
Right click and select Make Selection and CTRL J to copy it to a new layer and CTRL click on the new layer thumbnail to activate the selection
Setup the Graditent
Draw the gradient from right to left holding the shift key as you go
P.S. it's not exactly the same so you'll have to play around to get the same effect.