This is not easy to describe if you are REALLY new to cad. You could draw it with just a few commands - circle, line, copy, trim, text, move, rotate, etc.

See a typical gauge at http://www.allproducts.com/tool/sumake/Product-20094493616.html

It looks about what you need but with more divisions for 0.1 bar.
To make decent  jpg's you may need to thicken the divisions and text by using polylines with width rather than lines, and True Type fonts rather than .shx fonts, etc.

To create 160 images I suggest automating the process with a "script" file (or lisp).
Adjusting the drawing for each image would involve rotating the pointer by a pre-set amount (angle), then the command "jpgout" then an image file name; repeat.  The pointer should be a "block" or "group" so it can be rotated as a single object. This series of commands could be written using a word processor, saved to a ".scr" file.