Saab 99 in the typical color scheme for the Petro. Tommi 24.3.2013, 23:50 Full size 1000 × 563 pixels Previous imageRefueling the Petro. Next imageSaab Petro dual fuel system schematic. Switches from the left: Cold start, fuel gauge (change display petroleum/gasoline), change fuel (petroleum/gasoline), petroleum indicator light. Leave a Reply Cancel reply Your e-mail address will not be published. Required fields are marked *CommentName* Email* Website Save my name, email, and site URL in my browser for next time I post a comment. Notify me of new posts by email.