Another One of Those Single Turbo Conversions

[NOTORIOUS VR]

This doesn't make sense. How can the return come from the regulator if you have the feed going to the regulator inlet and the regulator outlet going to the dead ended rails? if you put the return between the feed and regulator, the regulator won't see much pressure. If you put the return between the regulator and the rails, the rails won't see much pressure. Unless I'm misunderstanding you.

Aftermarket regulators can work this way.

Feed > Regulator > Output
           |
        Return

[mauromj]

Aftermarket regulators can work this way.

Feed > Regulator > Output
           |
        Return

Yup, and this is how I have it in the drawing.

[NOTORIOUS VR]

Yup, and this is how I have it in the drawing.

Your drawing is wrong still.