Can I use line style Stitch as tangent line instead of Phantom?

you can change your default line for Tangent.

Ernie Lorenzo wrote:

 

Phantom lines looks like hidden or center lines to me. Is Stitch lines acceptable to use as tangent lines in drafting practices?

You will confuse most anyone else that looks at your drawings by not having tangent lines be shown as phantom lines.  If no one else uses your documents, you can do what ever you want.